I know that the Torah explicitly forbids adultery and also forbids selling the services of one's daughter:
Lev 19:29 Do not prostitute thy daughter, to cause her to be a whore; lest the land fall to whoredom, and the land become full of wickedness.
But what about having sex with a prostitute. For example, is a Jewish man forbidden to have sexual relations with a foreign gentile prostitute?
My thought is that in the absence of birth control that it would be forbidden but I don't like to presume.