Okay, I am not saying he should perform something that is distasteful to him, but I am saying he should explore (maybe in therapy, maybe just with you, but you should be part of this exploration either way) why he feels the vagina is dirty. The vagina is a self-cleaning gadget. The vulva (the outside of the vagina, and the area around it) can be cleaned with a washcloth and some soap and water. Even if he doesn't want to mess around when you're on your period, afterwards, once you've bathed or showered, I don't see the problem. Urine is sterile, but again, easily cleaned off. Men can get health issues in the genital area, too. What if you got a gyno exam and it came back clean and negative? Then, what's the argument?

I just don't buy that it's his age. I've known and heard of lots of guys who are his age and older who love to go down south.