Sperm Wars is a primarily nonfiction book by evolutionary biologist Robin Baker. Originally Baker calls these fertile sperm "egg-getters", and claims that the rest of the sperm in the ejaculate are infertile "kamikaze sperm" or "blockers", whose.
Keeping sperm from being ejaculated may provide the key to creating a birth control drug for men, according to a new mouse study.
Fertil Steril. Sep;62(3) The effect of calcium ion channel blockers on sperm fertilization potential. Benoff S(1), Cooper GW, Hurley I, Mandel FS.