best he watch porn and masturbate then he go out and about with other girls. its totally natural to watch porn and express oneself. if u take that away from him he might go behind ur back. my boyfriend used to watch porn until i kept annoying him.i would join him and asked silly questions and laugh at the poor acting these pornstars give. and he would try to attempt to answer all my silly questions. we would laugh together.now he has no interest in porn. afterall,maybe u could learn a thing or two on what his preference in sex and maybe he would want u to perform it on him.use psychology on him.that might get him to stop.
It it's happen to me I'm going to be dissapointed too. I would prolly be super mad at him...
spend more time with him.seduce him i guess