My son ejaculates on his sheets. I'm not sure how to handle this

My son is 15, and I notice that when I empty his laundry hamper, the sheets always have a lot of semen stains on them. I've also noticed that there's a semen stain on the mattress cover. I washed his sheets one night and the next day he forgot to make up his bed. I saw that there were already 3 semen stains on the sheets. I'm not really sure how to handle this. He doesn't do his own laundry because he's busy with several activities this summer. via /r/Parenting http://ift.tt/2tZQroX