I have this friend, it has been a long time unspoken secret that he sports only one testicle. Making the msitake of sharing this secret with a friend many years ago, has led the story to propogate it’s way throuhout our groups of friends. The strange irony of the situation is the friends last name is “sacks”, if only he was able to share in the humor 
Over the years, many a question has risen in regards to single testicle people in general, so I ask here, in hopes that someone can help out a bit. Firstly, I am not sure as to whether there is a difference in being born with only one testicle, or having it surgicaly removed for medical reasons, but I have been wondering the folowing…
Is it generally true that having only one testicle renders you sterile, and does being born with only one versus having one removed yield different results?
Does the testicle hand to the left, right, or oddly dangle in the center?
I have also heard that for example, a person who loses their site, will gain stronger senses in other areas to compensate, assuming that is true, would the one testicle be unusually largge?
I think that pretty much covers it, thank you for your time
I don’t really have any desire to “explore” his single testicle, so I’ll just direct you here. 
Lonely testicles are not unheard of in the medical history.
Cecil on single testicles:
Did Hitler have only one testicle?
quoting:
Hopefully your friend at doesn’t share any other treats with lunatic madmen.
(Man, the things I’ll do to fight ignorance…) :o
I was born with one testicle undescended. The undescended testicle was removed at age 4. The remaining testicle hangs more or less in the center, I suppose.
The doctor tells me it is somewhat larger than a testicle would usually be (though not grotesquely so), and that this is my body’s way of compensating for the missing family jewel. (So your speculation in that department was on the mark.)
My development was normal. In fact, I went through puberty earlier than most of my peers. I’ve also got a hairy chest, from which I surmise that hormone production is normal. Sex life is normal, too, and I am fertile.
None of the women I’ve been with has ever made the slightest issue of the situation, and I’m at ease with it myself.
I have no desire for world conquest, though I would not refuse the title of Emperor were it offered.
I do not own a red sports car. 
Being female, I suppose I can’t really give a first-hand answer to this, but I had a past intimate relationship with a male who was “monorchidistic” (it is at least one correct medical term for the condition, and will give you pause next time you look at orchids - they do have the same linguistic base). The person I knew was born normal but suffered an accident during high school that required surgical removal of one testicle.
Physically, you would not notice any difference in such an individual (ha ha, didn’t plan that) at a casual glance - in the gym shower, for example. The pouch appears perfectly typical, and hangs at a normal centered position, not to either side - the skin of the scrotum (called rugae, if I remember correctly, and not to be confused with reggae ), with its amazing flexibility, has no trouble adjusting its interior contents slightly to acommodate the usual force of gravity and center itself, as you can imagine if you think of the changes routinely induced by temperature. The whole works was slightly smaller than typical overall, as you would expect (but much less so than you would probably think), and round instead of divided, but the testicle itself was of entirely normal size, neither bigger nor smaller - perhaps this is one detail that is in fact afffected by whether it is a pre- or after-birth condition, as indicated by spoke-. (Again, note that you would have to be looking close-up to see this sort of detail.) Besides your clear question of size, I’m not sure what you meant by the part about gaining stronger senses to compensate - no part of this man’s anatomy was of any unusual size, nor was there any extra sensitivity, potency, etc, and masculine characteristics like chest hair, facial hair, etc, were typical. At the same time (and to address another of your questions), there was certainly nothing deficient in his potency, nor in his fertility as far as I know, and as a partner I was not even slightly bothered by the condition - in fact, it made for a very tidy package. I know for a fact (medical reading) that one testicle can produce adequate amounts of hormones, sperm, and anything else necessary for a man to operate normally (just as you can live normally with one kidney, for example), and this would not be affected by whether the condition was the result of birth error or later accident. I also knew another person who was born with undescended testicles (hmm, I’d never noticed this pattern before…but those are the only two “special” cases I can think of) and had surgery as an infant or small child to correct it. He too was perfectly normal sexually, as I can attest, and reproductively too, since he later impregnated a female. He did, however, have to have double hernia surgery as an adult, which is of course one of the primary dangers of undescended testicles - as I understand it, the corrective surgery itself creates a weak point in the tissue that is easy to rupture in later life. If such a condition at birth is complicated by other problems/abnormalities with the vas deferens or other “plumbing”, or if there is a genetic or hormonal problem, then these may affect fertility or the ability to perform, but the undescended testicle per se (assuming it is surgically corrected), or the presence of only one testicle outside the body, does not affect one’s normal male functions in any way, nor does it noticably change anything beyond the norm.
Having answered your questions (I think), I will mention a slightly humorous story shared by my singularly endowed aquaintance way back when: When he returned to school after the operation, his friends, who knew what had happened, would taunt him by saying, “We’re in stereo and you’re in mono!”
(Do I need to explain that now that record players and albums are relics?) 
Hope it has been enlightening to get the “veiw from the other side”, so to speak!
I can’t believe I’m actually asking this question, but do you mean there is no shopping divider? I had always assumed that it would be in one lobe or the other, and the other would be kind of deflated.
[checking…]
Nah. Seems to move freely through its “domain.”
Contrary to such other physical examples as might spring to mind (like lungs, for example), there wouldn’t be much purpose in a “divider” between the two testes, as they basically occupy the same space and don’t have much biological call to operate independently, even in life-threatening situations.
Consider it - is there a divider between your two (I’m being presumptious about your gender here, of course) that seperates it into dual chambers? I can see how the routine of what you’re used to seeing might make you think along those lines, but if you analyze and feel, you will probably conclude that it’s really just one general mass - though definitely with two sections - in a flexible containment area. Not a dumb idea, by any means, but if you check it out you can probably see why it wouldn’t necessarily apply.
As if I would know.
But I liked your concept of a “shopping divider”
[“Two for one special on orchids in aisle one!”]
My uniball story:
I knew a guy that only had one testicle. He lost his in an accident, when his car lost a head-on contest with a semi truck. His femur snapped, and the broken end was shoved through the inside of his leg and into his crotch, turning his testicle into so much mush.
Ouch.
No divider. I don’t recall the medical name for it off the top of my head, but the testicles and associated tubage can get twisted up. It’s apparently extraordinarily painful.
I found myself in a One Testicle Scenario a number of years ago.
One afternoon I was at the residence of my Lady Friend taking a shower when I felt a Nasty Twinge in the groin area.
I have experienced Groin Strain on a number of occasions, for reasons which are not relevant to this post, but this time I knew that something was Definitely Wrong.
LF was despatched to the doctor for guidance in the matter, and duly returned with a packet of Anadin and a Parking Ticket (subsequently rescinded by the police on compassionate grounds).
The doctor arrived later (he had been watching Manchester United versus Arsenal on the television, I forget the score) and, to my consternation, he was unable to greatly assist my predicament.
Now, LF and myself had been scheduled to attend a function related to her employment that evening, namely the Company Ball.
I kid you not.
Anyway, following a disagreement too complex in nature to discuss at this time, I drove the 70 miles home with flies open, left hand massaging the groin area and one eye peeled for the Police.
I managed to pass a difficult night by trying not to think about sex At All, which is easier said than done when your life probably depends on it.
I went to work the next day wearing Loose Fitting Trousers and a Pained Expression. To cut a long story short, I drove to my own doctor’s surgery that evening, I was given a note for the Casualty Department at the local hospital, and told to Go Straight There without going home to collect my Pyjamas.
An operation there took place in which the Offending Testicle, or 50% of the contents of my Scrotum, was removed for my own safety and wellbeing.
I hate hearing about other people’s operations, don’t you?
Anyway, the operation was a Complete Success. During one of my follow-up visits for Post Surgery Care, the following exchange took place between a Senior Doctor and myself:
SeniorDoctor Are you managing OK with your one testicle?
Nostradamus I walk with a pronounced limp. Can you shorten one of my legs or something?
Him I don’t have my saw with me. There is something we can do for you if you wish.
Me I’m all ears. Well, more ears that testicles anyway.
Him Well, we can open you up and insert, er, a Plastic Testicle.
Me The Wonders of Modern Science. Plastic Testicles can produce sperm can they?
Him No. Don’t be silly Mr. Nostradamus. It’s just that some men feel vulnerable in a Communal Shower Situation, say after playing football, or maybe following an Orgy.
Me I don’t play football.
Him Nevertheless. If at any time in the future you wish to undergo the Prosthesis Experience vis-a-vis your missing testicle, please let me know.
Me I don’t think so. I know you lot. You’ll start with a testicle and while I’m under anaesthetic you’ll replace a few more Important Bits just for the hell of it. Thank you and Goodbye.
I am living testimony, along with spoke- and just about every guy cygnus has ever met, that Monotesticularityness is no bar to a perfectly normal and healthy sex life.
Whilst not actually recommending the Operation, I can say that one or two women have commented on a certain Unexpected Vigour on the part of yours truly, given the shortfall in the genital area of the Temple that is my body.
If this does happen to any guy out there, upon recovery and return to normal life, I suggest they do not use the following chat-up line, for example:
Well hello there. I’m Nostradamus and I’ve only got One Ball.
It doesn’t seem to work.
IANAD, but I heard Dr. Drew talk about this one night on Love Line. He said that an undecended testicle is a serious problem, as it can turn cancerous quite easily.
No uniball story, but I knew a guy in high school who had three.
Beavis or Butthead at a microphone:
“Testes, testes, one…two…THREE??!”
WHAT?!?!? You interrupted a SOCCER GAME just because you were losing a TESTICLE?!?!?! What the fuck do you think you were given TWO for?
But seriously, I’m taking gross anatomy now and the cadaver I’m dissecting only seemed to have one testicle when we got to that part. After much discussion we got an old and experienced pathologist to look at him, and he said that there were actually two testicles there, but that one of the testes had atrophied because the patient (who was born around 1905, so probably isn’t Hitler) had caught the mumps after puberty and it infected his testicle. So if you only have one ball, that’s a possible reason for it.
Anyway, to answer the OP, such a condition doesn’t make much of a difference in your fertility, and our subject’s one testicle pretty much hung in the middle. I don’t think that condition would give you any physical traits that would compensate for it, but he was in pretty good shape for someone that old.
Which is why the undescended testicle is removed, generally before age 5.
Informative stuff, gentlemen. May your bags be appropriately sized for the occasion. Nostradamus, your use of capitalisation was quite masterful - it turned a good post into a great one.