You are over-analyzing this. The first time your girlfriend withholds sex, you just say "no problem, I'll just see a hooker". She will probably respond "Ha, you can't get it anywhere else". You just shrug your shoulders, like you don't care, and say "whatever". And you head for the door. She will ask you where you are going. You say "to a hooker". And this will trigger the same response as in the "dread game" story, but not much game required. Sex is sex, and women compete for exclusive rights. She will rape you before you reach the door. The key is to make sure that she doesn't take you for granted.