Is it true, there's no one like your first?

So I became friends with this guy, we talked all the time, then we slept together one night. It was my first, and he knew because I told him right before. I wasn't pressured into it. It was a really good experience. Well since then I've slept with two other people, and I just keep going back to that first guy. I didn't like the other two experiences. Me and the first guy decided that we would be friends with benefits. And I'm actually okay with that. But anyway, I just really like having sex with him. Do you think it's because he was my first or it's just really that good(in my opinion of course)?