The most passionate feeling after love is sex. It has often been used as a weapon in a relationship by either of the partners. If we focus on the occasions and reasons as to when and where sex has been used as a weapon by your partner, you would be surprised indeed.
There are many key decisions in life which you might hesitate to take in the normal course. Your girl would always know your weakness and it is in such situations that she will use sex as a weapon to incite you and give in to her demands. No doubt, once you agree to her posturing she will make you feel happy and you are likely to give in to her demands too.

In any relationship, a time comes when any partner wants to show their dominance. Though you might have dominated over her in normal course when it comes to her showing the dominating part, sex will, of course, be used by her as a weapon and you are sure to accept her dominance.
When you fulfill her desires your girl is likely to be happy with you. She will, therefore, use sex as a weapon to her advantage to make you realize that if you keep her happy she will fulfill all your wild desires.