As a young guy, I once read a book by the famous "Happy Hooker", Xaviera Hollander. In it, she answers questions about sex, speaking from her experiences as a female pimp. One question she answers is: "how can a man tell whether a woman has had an orgasm during intercourse?" Her answer: "when your penis is wet to the balls, you can be sure that she's had fun". Now is this really true? Some of my sex partners are spontaneously very wet, even before the sex starts, and then, when you enter, they just remain as wet. With others, they are not so wet at the start, but end up soaking the bed-sheets. Finally, some are wet at the beginning but dry up near the end. Confusing!