I think this is semantics.
Males cannot have multiple orgasms.
Females can have multiple orgasms.
Nothing about that says all women will have multiple orgasms.
Well, yeah, this whole thread is about semantics. Substitute “babies” for “multiple orgasms” and nothing significant changes.
There are no bright-line differences that separate every “woman” from every “man.”
Females can have multiple orgasms, except those that can’t – doesn’t seem to be a very useful distinction. (Again, setting aside transwomen for the moment, of course)
The bright line is it is possible for women but not for men.
Zero men can do this (except maybe Sting 
).
Some women can do this.
Seems a difference to me.
Well, then having babies is a much easier and more well-understood differentiator.
I would mention that you should clarify that zero cismen can do this, because I’m sure there are plenty of transmen who can have them (babies and multiple orgasms).
ETA: While I’m at it, zero ciswomen can produce sperm, but you still can’t say, “a cismale is someone who produces sperm”.
If you want to add trans men/women to the debate (which you seem split on) then that’s up to you.
Not really. The inclusion of those you deem to be “only male” and “only female” seems to be the artificial construct here.
Did the OP specify this?
I think transwomen and transmen make it even less likely you’ll find a bright line difference. I’m just trying to be clear in my terminology here. “Zero men can have multiple orgasms” is simply incorrect, because some transmen can.
So, I’ve tried to be generous to the OP in looking for a bright line by setting transmen and women aside for the moment, but I still don’t think there’s a bright line, even if you only include cismen and women.
I guess it depends on how you phrase it:
This cis person can produce sperm/have babies, therefore that person is a cisman/ciswoman. That works.
This cisperson is male, which means…? Can’t have babies? No, plenty of ciswomen can’t. Can produce sperm? No, plenty of cismen can’t. Etc.
I think the multiple orgasm thing is a red herring.
Typical ordinary run of the mill males / men can have multiple orgasms. Which is to say one after another with some time interval in between.
Typical ordinary run of the mill females / women can have multiple orgasms. Which is to say one after another with some time interval in between.
The average time interval is longer for men than for women. A bunch longer. But IMO that’s a matter of degree, not of kind.
I recall reading about some researchers who conducted carefully-controlled studies with groups of toddlers. Presented with various toys, the boys gravitated toward trucks and the girls gravitated toward dolls. Supposedly the researchers made every attempt to eliminate bias (e.g. prior exposer to these toys) yet the results were fairly consistent. Can anyone find these studies?
OP, are you looking for something that is specific to (cis?)men vs (cis?)women? Or, something that can be a determining factor that a given person is a (cis?)man/woman?
That is, I think it’s fair to say that if a cis person can produce eggs, that cis person is a ciswoman.
It’s not fair to say that if a cis person cannot produce eggs then it’s a cis man, or not a cis woman or whatever.
Yes, and the biggest differences physically and in average behaviour are related to reproduction: romantic relationships, sex, child raising.
3 to 6 a day at age 85 is implausible without some kind of medical aid. The highest numbers of kids fathered I can find online are about 1000, which shows the large gap between theory and practice.
Great metaphor! And I agree with you. Humans are malleable, but not infinitely so.
If all we cared about was reproduction, then we could have a clean classification: biological sex in animals is defined based on the ability to produce eggs or sperm, and we could just say anyone definitely unable to do this, whether due to age, accident, or whatever other reason is neither male nor female (biologically speaking). This ability would be the only differentiator needed, and by definition always a true difference between the sexes.
But we don’t want to do that. It wouldn’t make sense because - in general and on average - there are a large number of differences between men and women, most of which don’t go away just because someone has reached the menopause or is otherwise infertile. It’s possible and reasonable to classify almost all humans as male or female, even those too old or young or otherwise unable to reproduce, because almost all belong to one of two fairly distinct clusters (as outlined by Chronos), and many of the differences separating those clusters are important to us as individuals and as a society. But then we end up with messy definitions, because we are classifying people based on multiple traits that may not all match up for any given individual.
Its my understanding that a sexually active woman in her early 20s who isn’t using contraception has something like a 25% chance of getting pregnant. However I think that is if they’re trying to get pregnant.
If a rich and powerful man had a harem made up of only young, fertile, healthy women he could potentially have far more kids than a thousand. About 1 in 200 people alive today are descended from genghis khan.
Why do I have certainty that this thread needs to brush-up on the difference between orgasm and ejaculation?
Ejaculation is the expulsion of semen from the penis. Orgasm is a feeling of intense pleasure, relaxation, and connection that is associated with sexual climax. In most men, orgasm and ejaculation happen simultaneously but they are in fact different physiological events that can occur independently of one another.
Ejaculatory and Orgasmic Disorders.
Challenge accepted
Sounds like just another Tuesday to me. 
From a biological perspective, the answer is very straightforward: males produce small gametes, while females produce large gametes. This is true across all sexually reproducing species and the definition has nothing to do with chromosomes or hormones or anything else (since those vary widely across species).
There is the complication that some individuals might not produce gametes at all due to injury or age or otherwise. In this case one might look to other clues like chromosomes. But this shouldn’t be confused with the definition of biological sex. The fact that some people are missing an arm doesn’t mean that humans aren’t bilaterally symmetric (like all vertebrates). One has to ask if they “would have” produced a certain gamete if it weren’t for some other issue.
There remains a small number of individuals who are truly ambiguous. This is about 0.02% of humans (note that the intersex rate is much higher, but most intersex people are still clearly male or female). All you can say is that they aren’t biologically male or female. There are no true human hermaphrodites (producing functional large and small gametes).
The official position of the United States is (as of last month):
https://womenshealth.gov/article/sex-based-definitions
There are only two sexes, female and male, because there are only two types of gametes. An individual human is either female or male based on whether the person is of the sex characterized by a reproductive system with the biological function of producing eggs (ova) or sperm.
The sex of a human, female or male, is determined genetically at conception (fertilization), and is observable before birth. Having the biological function to produce eggs or sperm does not require that eggs or sperm are ever produced. Some females or males may not or may no longer produce eggs or sperm due to factors such as age, congenital disorders or other developmental conditions, injury, or medical conditions that cause infertility.
A person’s sex is unchangeable and determined by objective biology. The use of hormones or surgical interventions do not change a person’s sex because such actions do not change the type of gamete that the person’s reproductive system has the biological function to produce. Rare disorders of sexual development do not constitute a third sex because these disorders do not lead to the production of a third gamete. That is, the reproductive system of a person with such a disorder does not produce gametes other than eggs or sperm.
Specifically,
- Sex is a person’s immutable biological classification as either male or female.
- Female is a person of the sex characterized by a reproductive system with the biological function of producing eggs (ova).
- Male is a person of the sex characterized by a reproductive system with the biological function of producing sperm.
- Woman is an adult human female.
- Girl is a minor human female.
- Man is an adult human male.
- Boy is a minor human male.
- Mother is a female parent.
- Father is a male parent.
~Max
In similar news, in North Korea Kim Jong Un is a god.
See also “Gulf of America”.