Probably cause the way a guy touches himself is different from when a woman gives a hand job. When guys masturbate it's not about lasting long at all. We don't light up candles and set the mood. It's about releasing and the quicker the better. You could look at it as a race. First one done wins!! I'm thinking it's the same deal for woman. A woman knows what makes her get off quick and goes straight for it. The problem is that people are to reserved and/or scared to talk about what goes on in the bedroom. Like it's taboo or something. If we were all a little bit more open, sexually and actually talked about what feels good and what doesn't we wouldn't be having this discussion.