Condoms and oral dams are your best protection against STIs.
It’s a good idea to make sure that you know how to use them correctly — and that you use them every time you have sex — even if the person you are going to have sex with is using other contraception, like the pill, IUD, injections or implant.
If you are going to have unprotected sex, it’s really important that you, and the person you are going to have sex with, both get STI tests before and after sex.
You never have to have unprotected sex with anyone. It is always wrong to make someone do anything sexual that they don’t want to do.