I do agree that it's not just gay men. I'm sure it will/has already spread to swinger clubs etc. But I do think it is related to promiscuity in general, meaning most of the population will not be affected. The cases originating from non-sexual interaction are a really small minority.
I think the men/women disparity is not really due to homosexuality but because due to societal views. A man who is promiscuous is viewed a as a 'cool go-getter'. A promiscuous woman is viewed as a 'slut' (Note: I don't agree with that!!). So it's just more common in men at first.