There must be a reason for these things

For some reason every time I visit my friends at the tattoo shop I used to work at we talk about twisted things. Sex in general, but it always ends up with anal sex. I don't know why. Another theme we seem to fixate on is transexuals. The question always comes up:

Would you have sex with a post-op male to female transexual? (If you prefer men then post-op female to male)