Given: a healthy adult male with a sperm count in the normal range. If said male ejaculates, and subsequently engages in further sexual activity, what’s his count likely to be with his next ejaculation? I know that time is the major factor here, so let’s consider the second event happening 1/2 hour after the first. Let’s also posit another occasion where the second ejcaulation is 1 full hour after the first. How many fewer swimmers, relatively speaking, will he have in each case?
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Bump.
Thanks though, Abby.
This is my final bump on this thread. If nobody has an answer, I can only hope that the SDSAB (or maybe even Cecil himself) is working on it.
Tell us more about why you need to know this, Cap’n.
Just like sperm count, your hypothetical ejaculations are really going to depend on the individual.
However, the typical ejaculate contains much less sperm than is actually needed for successful fertilization, so even though you’ll get a decrease in number with subsequent ejaculations, it shouldn’t make any real practical difference.
Sorry I can’t give you numbers. Wanna know about sheep sperm?
Jill, it’s a bit involved. One of the reasons is simple curiosity over how easily we men can empty the fish pond, as it were. There will always be a few swimmers in there, but how fast can a guy produce new ones in a time of reproductive need? In a sense, it could be useful research for couples who don’t believe in artificial birth control – we could call this the “blowjob method.” 
Lim, obviously specific numbers won’t be obtainable here. I’d be more than happy to get a percentage figure. Healthy male, 2 ejaculations spaced 1/2-hour apart, second load has X% fewer sperm in it on average. And I’ll assume that you meant
right?
That method doesn’t work from exact personal experience with my ex-wife.
Uh, yeah. Jesus, grad school is frying my brain.
I couldn’t even give you percentages for humans. Sorry.