Actually, while a top is cumming, he's in the height of orgasm. Some bottoms become very good at squeezing at will and keeping the top hard. With a former 5-year regular, he usually wanted me to shoot on his face; he'd then jack off to seeing all the cum he caused me to shoot. But, I really prefer cumming balls deep--just as I reach the point of no return, I shove my cock in as deep as possible and breed him deep; when a bottom squeezes my cock while I'm cumming, my orgasms are more intense, I cum for several seconds longer, and more of my cum goes deep where it should. The extreme sensitivity occurs after orgasm, and stimulation is not pleasurable at all but painful--please don't make a top who has just cum to endure it against his will; however, leaving my cock in the bottom for awhile after cumming or being gently sucked after feeding someone a load can actually keep me hard longer than usual after cumming. Regardless of age and refractory period, the extreme sensitively passes after a few minutes and leads to what married couples used to refer to as afterglow.