Being asexual is not enough of a reason? I literally have no will to do it. I think it’s gross and I don’t want to do it. If that’s not enough reason for you then I don’t care because it’s my body and he’s fine with it. 

It’s not like sex is the only means of physical intimacy. It’s not like I’m denying him physical affection, just sex, I’ll hold hands, hug, and cuddle him. The only other thing I won’t do with him is kiss (on the lips, cheek is fine)/make out because spit is gross and human mouths are fucking dirty.