His Prostate
Okay, so he really doesn't have a 'G-spot' per se, not like the spot Dr. Grafenberg named in women. But his prostate, properly stimulated, will give him the same kind of orgasmic pleasure your G gives you. The area right behind the scrotum and up to the anus is the perineum. You know the place, that hairless area. If you stimulate by pushing gently (until you find the right amount of pressure and motions) on the outside, this will squeeze the prostate and give him an orgasm he's never had before. It's the same as rubbing your G-spot on the outside to cause pressure on the inside. You can start by stroking it gently and build up as he's closer to orgasm. In an interview with men whose girlfriends had turned them on this way, all agreed it was the best sex they ever had. Also suggested was having the woman gently suck and lick the testicles while gently stroking the perineum.
So, light some candles, bathe each other or yourself and relax. Your favourite music or nature sounds,satin sheets, 300-count Egyptian cotton sheets, fluffy pillows...whatever soothes and carries you off to happiness and pure pleasure!
Experiment, experience and appreciate each other's bodies. And happy hunting!