Just curious which causes this or do both? The last time I had sex, she was on top and took all about 5 minutes or less of riding me and she came, but what was different this time is that I could feel her pussy pulsate around my dick. Never noticed it before and I've made her cum from both so it seems because when I'm deep she'll exclaim that I'm rubbing something and then seconds later, she'll come. I think anyways, could be naive about it, that's why I'm curious. I've noticed before when she would squeeze with kegels during sex, but this time it was completely involuntary.