&gt; <i>Though there will be fewer gay people if the theory that homosexuality is genetic proves out unless we have a boom in surrogacy.</i><p>Or unless homosexuality correlates with some combination of genetic traits carried by heterosexuals --- if that turned out to be the case, then we&#x27;d expect gay people to continue to be born from time to time, due purely to the mix-and-match reproduction of heterosexuals, even if no gay person ever had children.