Hi there,
Please help me solve this problem. (And do pardon the nature of its content. It is sexually related.)
If I were to release my sperms in an average sized bath tub filled with warm water and my girlfriend were to be at the other end of the tub (we’re both naked of course), what are the chances of her getting pregnant?
Take into account, the mildly alkaline soapy water, temperature (approximately 107 F / 42 C) and the increased distance my sperms to have to cross to finally reach her and fertilize her.
So can hot tub sex really be the most pleasureful way of bathing without having to use a contraceptive and still avoid pregnancy? 
Worst Big Bang Theory episode ever.
Not an answer to your question, but I thought I would just point out that you’re doing it wrong.
That is pleasurable sex?
Without doing the precise math or science I can tell you that the answer is “exceedingly small”. Too high a temperature kills sperm. The wrong pH kills sperm. Having to swim across a freaking hottub, unless there a water jet shooting a stream of water straight from you to her hoohah, will kill sperm.
Heck, even just having sex the normal way is hardly a guarantee of pregnancy. Is there a non-zero chance of pregnancy? Probably. But while you’re buying contraceptives, you might also want to pick up a lottery ticket because man, those are some long odds.
Also, unless you’re a fish, releasing your sperm into the water to find its way to your partner’s eggs is a very, very, very loose definition of “sex”.
How do you release sperm at the opposite side of the hot tub from your girlfriend and call it sex?
Foot fetish. 
Isn’t this basically how fish reproduce?
I’d watch it. 
Eh. Zach already told that story, right before the karaoke singing and LeVar Burton showing up
On the internet no one knows you are a fish.
It won’t happen. Getting pregnant is a lot more biologically complicated than you think. Have fun.
My guess (and it’s just a guess), is that even before we get into the biology, temperature and chemical aspects, the probability of getting pregnant would be significantly lessened due to social constraints. Perhaps we need a poll.
If someone in a hot tub starts jacking off, do you
A. Leave
B. Stay
uh - not in a hot tub they don’t -
And if you want to be accurate about it - the male fish releases the sperm at/near/ontop of the eggs that the female laid - so - its not from accross the lake and its not in 100+ degree water.
Is it MY hot tub? Because, if it is, there should be a third choice.
It’ll reduce your chances, and not just immediately. From health.com:
*“Wet heat” isn’t good for the testes, and, according to a study published in 2007, even 30 minutes in a Jacuzzi or hot tub can temporarily decrease sperm production. However, this study also showed that the negative effects of wet heat on sperm may be reversible.
Dr. Shin counters that wet heat exposure can impact a man’s sperm for a surprisingly long time. Because sperm takes so long to mature, “any interventions [to reduce exposure] will usually take at least three, if not six to nine, months to show any benefit,” he says.*
Yet another reason for me to avoid Jacuzzis. Semen in the intake/jets.
Didn’t the Fonz address this question in that episode where he was a substitute teacher and the students tricked him into doing sex ed? A girl in the class asked if she could get pregnant swimming with a guy?
IIRC I read of a girl getting pregnant using a bath tub after her brother.
I remember this too. Seems like no one believed her than either.