Sure they can, if by producing one homosexual child, they also create a more fertile female child, as is now though to be the case (
http://www.medicalnewstoday.com/articles/111843.php).
In addition, your assertion that homosexuality is unnatural is just stupid, because most or all mammalian (and many avian--see the gay penguins raising an abandoned egg)) species have homosexuality.
On top of that, it's more than a bit odd that a freedom advocate at Ron Paul Forums thinks that any good at all can come of centrally directed sexual reforms.
I hope your head is ringing with cognitive dissonance by now, and maybe you'll not be so quick to blame what is either a personal choice or a genetic difference for socialist decay.
It should also be noted that the Romans didn't have a liberal attitude towards homosexuality either. You're thinking of the Greeks, who were at the apex of their civilization while supporting sexual liberalism (at least in some of their city-states).