Lewd
Can't get past this scenario I imagined in my head of like... A main character young 20s girl who is a virgin, sitting in the back of a car at night with her friend and their boyfriend. The friend and boyfriend are going at it while she's topless and her friend is laying back in her lap.
I don't know why this particular scenario is so appealing to me. In my head the girl is more like, curious and obliging than horny.