A guy who has spent more time with men pumping
semen into his
ass and mouth than with his own penis inside of a
woman. If he's very dedicated and really gets "into it", he probably has "bareback" or unprotected sex, which he prefers for the sensation of his partner's throbbing member rubbing against and stimulating his prostate, which serves as his male
g-spot, as well as the feeling of having his rectum filled with semen, which is known colloquially among gays as "getting bred".