I am 100% confident that there were homosexuals in the groups Price studied. I say this because homosexuality is a natural phenomena. As a previous poster mentioned, it's been found in virtually every species.
Homosexuality is fairly well understood in several academic disciplines.
Anthropologists and primatologists refer to homosexuality as a manifestation of "kin selection" (
http://en.wikipedia.org/wiki/Kin_selection). When you have gay relatives, they help raise your offspring which give your offspring an adaptive advantage. Gay aunts and uncles collect and process food, help protect the group, provide child care, etc.--all without producing competition for your children.
Many species reproduce just fine asexually (they are all homosexuals)--although all such species are all female. I've never seen any accounts of all male asexual reproducing species--not that I look for this kind of thing.
Animal biology studies have shown that it is possible to not only control the sexual orientation of offspring, but also their sex and gender behavior. They could produce the following variations:
Hetero Male Male acting
Hetero Male Female acting
Hetero Female Female acting
Hetero Female Male acting
Homo Male Male acting
Homo Male Female Acting
Homo Female Female Acting
Homo Female Male Acting
The key is the timing, type and quantity of hormonal exposure in utero.
What's interesting to note is that all of the above variations have expression in humans--we've all seen these sterotypes:
Hetero Male Male acting--typical macho man
Hetero Male Female acting--effeminate man, but often married with children, suspected of being gay, but actually isn't
Hetero Female Female acting--typical feminine woman
Hetero Female Male acting--Masculine/gender neutral woman (Here Comes Pat), but often married with children, suspected of being gay, but actually isn't
Homo Male Male acting--Leather boy
Homo Male Female Acting--Flamboyant "queen"
Homo Female Female Acting--Love poetry lesbians
Homo Female Male Acting--"Diesel dyke"
See we all know the sterotypes, yet we often have a hard time working backwards to understand that these are all manifestations of the natural variation in the three basic sexual characteristics.
Here is a link to an interesting article about it:
http://frank.mtsu.edu/~phollowa/5sexes.htmlThe truly sad thing about this is the difficult position our culture puts trans-gendered people into. As you can see, when they say they feel like "a woman trapped in a man's body"--they aren't kidding, but I digress.
As for diet. Perhaps phyto-estrogens in soy and other plant based foods has an effect. There certainly have been numerous other, sexual related effects observed.
Ever watch Japanese porn? Man those guys have effeminate bodies and smallish penises. Now of course it's possible that Japanese porn producers just use regular guys where as American porn producers hunt down the more well endowed. I don't know much about Japanese porn. This last point is purely anecdotal by the way.
But milk, blood, fat and muscle tissue are all full of hormones so I'm not sure exactly how hormones in food really affect our health or reproduction.