I generally wear briefs so when I get an erection, it can become painful really quickly, pointing the wrong way. If Im naked, it feels different...it goes from soft to hard, up a little then a hesitation, then up more, following my heartbeat I guess, repeating until its fully hard. I had one GF who loved watching it as I got an erection.
First I would spend some time exploring my new pussy...what it felt like to be penetrated, and suing a vibe until I had a few good orgasms. Then, partner sex...both men and women. Oh and like someone mentioned, I would have to try a sybian.
I was 12. It was shortly after my first cum from a wet dream.
Personally it doesnt really mater to me one way or the other. If she does swallow its nice for the simple reason the sensations dont stop and then change. But like someone said, Im having an orgasm...its all good.