Having no official research in this matter, I would suggest that there are (at least) two things happening here.
1) a genetic predisposition to speak a certain way.
2) learned behaviour (i.e. affectations and turns of phrase - e.g. Girlfriend!)
In the scenario I am imagining, a certain gentleman with a genetic disposition for speaking with a feminine lilt, becomes popular in the gay community. His way of speaking (also shared by other with the same genetic disposition -- gay or not) becomes popular within his community. A condition makes a trend.
No idea if this is valid but it makes an interesting scenario.
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