Having a man's erect penis sliding in and out of your rectum stimulates your prostate gland and can often bring on a spontaneous climax without having to even touch yourself.
to cdelmas :Especially when the stimulation of your prostate gland by his erect penis sliding in and out makes you get an intense orgasm with lots of cum.
Having a guy do me like that makes me feel like I'm united with every part of my body and I’m suddenly connected in with new crazy connections. I so wish he was doing me that way to.