For years I would get the most painful blue balls ever if I ever attempted this, which always forced me to finish. It was just the worst stomach ache for days until I O. Recently I was videos of techniques on how to do this properly. I tried it 2 weeks ago and have used it a few times since on,y a few days after I O. Usually my Blue balls/stomach ache wouldnt be so bad only a few days after anyway. So far it has work well, but on a couple of occassions I ended up Oing because it wasn't as satisfying not to O. Anyone have advice for this?