This just reminds me of an old experiment that tried to use artificial group selection to make Tribolium insects ( http://www.pnas.org/cgi/reprint/73/12/4604.pdf ) restrain their breeding, when instead they just ended up cannibalizing others' eggs (focusing on the females). People say HIV is a good excuse to fear having sex at all, conspiracies about the Vatican suggest it was developed for such a purpose, but nope, people just use condoms. Humans are as silly and fascinating as all the other life around here.