Thats why you would have a seperate room for mixed growing and a room for sinsemillia if your serious about growing and not wasting plants by killing them. And it's not a matter of if, but when. If you grow males and females in a room your plants will be pollinated. But anyways even though it's possible to make hash from the male leaves or w/e I dont think it makes much sense. Just make hash from the females.