Yep!
Definitely a case of honesty being the best policy. A man who books a working lady for sex is quite reasonably expecting a woman, not a castrated and mutilated man which, in my humble opinion, is all a so-called "transsexual" is.
I have nothing against trannies - if that is how they want to live their lives that is their right but I don't want to interact with them sexually and that is my right. If they try and pass themselves off as women often enough they will eventually encounter some homophobic roughneck who will beat the hell out of them.