Men viewing erotic material suggestive of sperm competition (two men with one woman) produce ejaculates containing a higher percentage of motile sperm than men viewing explicit images of only three women.
(Ryan and Jethá, 231, referring to research by Kilgallon and Simmons)
I’m finding it a bit hard to draw that conclusion from this when there’s no precisely-one-male-present condition, and I don’t see any mention of any experiments that did do that in the actual article, either. It could just be due to the presence of a male, and not the number of them.
Perhaps more importantly, it’s also not clear that what pornography men like should correlate with what causes them to produce more motile sperm!
(Ryan and Jethá, 231, referring to research by Kilgallon and Simmons)
I’m finding it a bit hard to draw that conclusion from this when there’s no precisely-one-male-present condition, and I don’t see any mention of any experiments that did do that in the actual article, either. It could just be due to the presence of a male, and not the number of them.
Perhaps more importantly, it’s also not clear that what pornography men like should correlate with what causes them to produce more motile sperm!