I want to say it’s both, but I may have to do some “research” and get back to you! Seems like I’m getting right to the edge and then kegel stopping it, but I might just be stopping the stimulation just in time. Sometimes it’s too late, and I just bust when I release, but usually I can get a partial orgasm with no nut, and build into a big one. Lol last chick I slept with was some sort of mad scientist. She knew when I was holding one, and would employ her own kegels to completely ruin me.