New sex partner. What do I tell him?

So I’ve only had sex with one guy because I was dating him for over 2 years. Anyways, I think I can only orgasm through clit simulation. But I don’t know how to tell another guy. Like do I just let them do whatever they do or ?

Because I didn’t know before my ex. So we figured it out together as we both experimented together and had no experience before we got together

Thanks