How do you talk dirty to your man/SO????

When me and my boyfriend was having sex last night he wanted me to talk dirty to him but I don’t know how! When he asked me I was very embarrassed and he got really mad at me because I just lay there and frozen up, I didn’t know what to say. I don’t trust anyone because I was rape for about 17 years growing up, I was VERY scared to tell anyone until I got out on my own!!! I’m working on my self a little bit at a time. I’m in a really good relationship and it’s my first relationship and don’t want to miss this up. Please help me out on some ideas to say tonight! Thanks