I think there are some physical compatibility issues sometimes. My partner cums quickly when I press deep into her and when she cums she makes lots of nice sounds which make me really horny then I cum. We are very compatible sexually. She gets a lot of pleasure from deep penatration which is cool because I don't want to have to go down on her everytime we have sex to make her cum. She has very powerful multiple orgasms when we are in the missionary position. She says no other partner had made her cum in that position. She also cums when she is on top & when I am behind her like spooning while I rub her clit.