What do you offer?
There are all sorts of different kinds of sex. What do you clients want? What do you want to offer? Not every sex act has the same level of risk. Some carry a greater risk of contracting sexually transmitted infections or HIV. Get some more information here and then decide what it is you are prepared to do. If there is anything that you don’t understand or don’t want to do, then don’t do it. Not even for money. The same goes for stuff that might be too personal or too intimate, such as kissing. Don’t do it and tell your client that you are not going to do before you meet them. And tell every client that you have sex with that you will only do safe sex.
Fucking (anal intercourse, active, passive)
Various diseases can be transmitted by fucking, including sexually transmitted infections and HIV. Using a condom is the only way to protect against HIV infection, no matter whether you are active or passive. Use plenty of water-based lubricant. Never use skin cream, massage oil or butter. Fat can damage condoms and mean that they don’t protect anymore, even if they stay intact. Fucking without condoms is called bare-backing or unsafe sex. HIV and STIs can be easily transmitted this way. Never offer your client unsafe sex. And never agree to have unsafe sex, even if your client is willing to offer you lots of money for it.