Sorry, guys: if your partner is short or beautiful (and, hopefully, it's a combination of the two), she's probably just putting on a show in bed. Most women of those varieties fake an orgasm more often than the average middle-sized, homely girl. That's not to say she doesn't enjoy the sex, it's just that she wants you to feel good, or she's signaling you to finish...oh, and she might not like you all that much, but, well, you're fucking a beautiful short woman, so you've got nothing to complain about.