Re /m19:
Consider the older case of kids (not in the physical sense)
pretending to be female online and having "lesbian" cybersex in
chat rooms or on irc. They are not real lesbians, nor necessarily
at all sexually open. But they are roleplaying. No new words
needed, yet.

But I'd suggest a suffix '-play' if you really want to coin
some. 'gayplay' for your situation, 'lesbplay' for mine. Plus
plain old 'maleplay' (female pretending to be male in any
situations), 'femplay' (male pretending to be female in any
situations), etc.