It is better to just do a working for a partner. The big problem with prostitutes, other than potential diseases, destructive lifestyle, etc is the amount of energy links you will receive by just having sex with that one person. When you have sex you astral merge and are connected to a person. Meaning they've done that with many other people so it will also effect you. As someone said, after sex with anyone get rid of the energy links. Keeping those links can cause trouble in your life. And yes sometimes it gets addicting. You pay good money for maybe 30 mins of sex. It's kind of like a rush or high you get. Like gambling. It's way better, safer, and free to just work for a partner.
And no you cannot have sexual or romantical contact with other races. It will destroy your soul and cause many other bad problems. It's just too risky and not worth it. Besides everyone has the same reproductive organs.. sex doesn't change no matter what color the person. The way I think of it is a male is a plug and a female is an outlit. Your plug is only desigend to work with a certain type of outlit. Anything else can cause a power outage. Anything you do now ultimately can set you back. So you become a bit farther from achieving godhood.