In addition to being an outlet for sexual, emotional and psychological frustrations, the hobby exists to fulfill fantasies. Every person here, whether they will admit it or not, harbors some sort of fantasy that they would be hesitant to admit in the civilian world.
If you can't use the hobby as a springboard to explore your innermost desires, if you can't truly be honest with your providers about what turns you on and what you want... then you're not taking full advantage of your participation in this game.
Aside from deviant behavior that causes physical/emotion/psychological damage to another person, or sexual encounters with minor children/animals or sex with adults without their consent... there isn't much someone can do here that will make me judge their desires. I may speak up and say that what a person is seeking (e.g, a gang bang experience) isn't something I personally would participate in, but I would immediately recommend some stellar providers that could fulfill that fantasy for them.
Statistics re: the number of men who have had a TS/strap-on experience can be a dangerous thing... I doubt there is any reliable research on that subject, either here or elsewhere. But then again, I was a political science major. I was taught to believe that 99% of statistics are made up, and the other 1% is probably exaggerated.