Tips for having orgasms during sex?

I'm in my first relationship. I love him, but I've only ever been able to have an orgasm with him when we use a vibrator during sex.

Once he gave me an orgasm manually, and once orally. But that's it. I'd really like to have an orgasm during sex just from him! I've been masturbating my whole life so I know what feels good. I've even been able to cum from just using a dildo, so I know that it's possible for me to orgasm without clitoral stimulation. So why can't I orgasm with another person? I am very comfortable with him and do trust him a lot. Any tips?? Please help!!