Yes, I realized that. She never mentioned homosexuals directly, and we are left to assume that their behaviour would have followed the same etiology as heterosexual men; all we're given as to how that progresses is what I mentioned earlier, but it's suggestive.
This was published in Analog, and it was the 70s; anything more explicit would probably not have made it over the editorial bar. I really can't remember any sort of sex but heterosex in Analog from that period. The story's allusion to pre-pubescent boys rather surprised me at the time.