You certainly shouldn't do it if you don't want. But -I think it is OK for him to ask - I would always want my partner to tell me their fantasies - as long as they understand that I will not be willing to do some of them. I think one should try to avoid expressing disgust for another's fantasies, it will discourage them for telling what they really like.

Asking is very different from pressuring - I can't really tell from the original post what this was.