The claim is that human sperm has different physical characteristics (i.e. phenotype) depending on whether it is carrying an X or Y chromosome. One theory is that sperm that carry the male ...
From the book Sperm Wars, by Robin Baker: Very few (less than 1 per cent) of the sperm in a human ejaculate are the elite, fertile 'egg-getters'. The remainder are infertile 'kamikaze' sperm whose ...
I don't know about you, but I heard this one day. It was because I was sucking lemons, and someone was like, "Why do you suck lemons, isn't it soooo sour?". I said it was very sour, but I liked sour. ...
The advice to wear boxer shorts instead of briefs seems reasonable at first glance, since for testes to produce sufficient quality and quantity of sperm, the temperature of testes must be ...