I can tell you a coupla things, although the reason for trying to 'turn' anyone isn't something I have any experience of.
1) The amount of times I receive sex-oriented PMs from supposedly "100% straight" members of LPSG indicates that, as in the outside world, not everyone who calls themselves 'straight' actually is. Consequently, some of the come-ons you receive may be from others who are aware that "100% straight" doesn't always equate to "100% straight" in reality.
2) I get more women than men adding themselves to my MSN without so much as introducing themselves. Go figure, you get all the guys, I get all the gals.

So maybe there is an element of wanting-that-which-you-can't-have coming into play here.