As rough as it may be, at this point I imagine he'll be relieved when he finds out it's not cheating, not dangerous, and not anything you want him to participate in in any way.

I have to think at least part of his issue is wondering if the stuff you're into is something you secretly want from him (kinda like when women find out hubby is into some kinky porn - doesn't always mean they want IRL kinky-porn-sex).

Still, your reluctance is completely understandable especially in light of his... less than fully supportive attitude about your entertainment preferences. But at this point I don't think you have a choice - it's kinda like he already knows, he just doesn't *know*, and that's going to eat away at you both until it's cleared up.