I wasnt either but it still happened because of who she was. Going for the ass fast works either way for guys because
1. We get laid, which is what we want regardless
2. It puts the chick in a less powerful position. A Guys need to bang is usually stronger than chicks need to have a BF. So she now cant string guys along with hopes of getting laid while she dithers on and makes him pay for dates and shit.
Relationships are never 50-50, someone always has more power between a man and woman so this tactic is obviously geared toward the benefit of men so dont get too mad