With all due respect this is nonsense.
Anybody who's been around knows that men often exhibit these mannerisms yet are totally hetero in their sexual attractions.
And many men who are totally gay, who aren't the least bit attracted to women, exhibit none of these feminine mannerisms you mention.
and so it begins.
We could spot it easily as kids, and there does seem to be some kind of "gay sensibility." It's a stereotype, but gays really are florists, flight attendants, decorators, etc.
And since these stereotypes apply to gays from all over, there must be SOMETHING that gives them a common link. If not a gay gene, then I'm curious as to what it is.