my boyfriend and i have been having quite a bit of sex lately, he's 20, 5'10, 195 LBS, and muscular(if that makes a difference) lately when we've been having sex and he ejaculates i've noticed his semen is very opaque and thick and chunky, it comes out in one big blob. he doesn't masterbate very often, probably once or twice a week. and he stopped going to the gym so often. is there any spefific reason why his semen is turning out like that?