I was 18 when I finally had sex with my long term GF. She seemed very prim and proper but with me she was a different girl when she was aroused.
Was very much a 'no sex before marriage' girl in a big way. Until her best friend 'did the deed' and told her that 'it feels amazing.'
That changed everything and suddenly she was very interested in doing it.
I used to go and visit her at University. One morning she suddenly announced tha she 'wanted me to go up her' - so with no protection that was that - just so she could see what it felt like. Afterwards she started crying and was really sad that she had broken some sort of rule to herself. She honestly felt she was standing for 'something' by planning to wait until marriage. She was also worried that her Dad was 'going to find out somehow.'
She decided that now it was over with she would like to try again. The next night I wore a condom and that was our first proper sex. Her quite terrified over getting pregnant and asking me (when I was inside her) "you don't have AIDS do you? (that shows you what the Eighties was like!) and 'promise me you won't come inside me') Not exactly a turn on!
I didn't know any different at the time, but looking back I guess that wasn't a great set of 'first time experiences.'
Things got better with more practice - she wore lingerie more and liked the effect it had on me. We found she preferred to be fucked from behind and didn't like being on top. She wanted to explore a bit and there was a brief period where she 'wanted to be kinky' which included wanting different things pushed inside her. I didn't have many things to hand, but I remember she did ask me to put a small Torch up her!!
I think I enjoyed it more with my second GF who was on the Pill. That made a huge difference to me. The feeling was much different and the feeling of ejaculation was so so satisfying. She also helped me a lot with her openness and willingness to have sex and enjoy it. She was much more comfortable getting naked and also in giving me direction. "faster, slower, harder!"
So it took me a good 18months before I started to really enjoy sex. Up until that I was far more into being expertly wanked off rather than penetration.