Notice the last part of the sentence, PCOS could be used as a starting point, and it does bare more reseach.
It says no such thing.
It says "PCOS is more prevalent in lesbian women" and that the research "neither suggests nor indicates" any cause to lesbianism. The fact that thousands have left the homosexual lifestyle further supports the environmental factor, which is the major factor in determining homosexuality. That's what the studies state. Please read them:
Genetics and HomosexualityYou'll find articles dating from 1995 to the present.
Let's say big noses were more prevalent - would it make sense to say that big noses cause lesbianism.
Well, one glaring weakness is that it can't be the cause because there's a number who don't have big noses.
Let's say there is a greater prevalence of living in the south among patients with lung cancer.
Does that mean that the south causes lung cancer?