Though I do not feel like I am a member of either group, I think that a little camouflage helps one get their mind around the experience to actually consider it and maybe even go through with it. Plus, how many straight guys out there really want to be with a TG (umbrella terminology)? Better chances for success with someone of like mind, I would think. Plus again, playing with someone who dresses like you do creating the fantasy of a lesbian relationship. That can be pretty convincing to some.
