1. They like the words. http://www.xue90.cn来自《幽默学英语》网
2. Girls, at times, think that the "words" are important.
3. They can brag to their friends that they got him to do it.
4. It makes them feel all tingly to hear it.
5. Commitment/Power *evil grin*
6. He ain`t gettin ANY unless he does.
7. It makes up for what a jerk he is the rest of the time.
8. It makes sex better.
9. The woman can say it back without risking rejection.
10. The woman wants to see his dick fall off.