I had PIV (penis in vagina) sex for the first time at My Man's house, while he was staying with his parents while finishing up some stuff.
But, for some reason, I wouldn't let him go down on me. I have NO idea what was wrong with me. I thought he wouldn't want to or something. I was young. A few weeks later, he insisted he really wanted to, and we were in his car. OMG, what had I waited for? It was the most amazing thing. After a few times, I had my first orgasm with him from this. (I had been practicing on my own, just with my hands, no toys back then. But, up until then, I hadn't had an orgasm with him.) It only got better from then.
That was a LONG time ago.
Nobody does it like he does.