Lol was thinking about this today- very late on the piece. Nothing turns me on more than my girlfriend having a few loads of my cum sloshing around in her during the day. The best way I discovered to keep it all locked in is by using latex ben wah balls. They are weighted and jiggle around in her but keep her plugged right up with little to no leakage. She told me if she werent on the pill she wouldve been knocked up by now..