<human>: Can you give me the gist of the text in a nutshell?

We have been together nearly all of my adult life after college, and I had known him for a few years during school as well.

He knows me well enough to know that I am ultra conservative sexually. It isn't that I don't enjoy sex, but more that it is more emotional than physical for me, and as such, though I do like to try new positions and am generally fairly giving and open to sex, our bedroom life is fairly vanilla. 

he has tried introducing me to things in the past, I'm ok with light bondage, gagging, and very light bdsm, but don't want to go too much further into it than that. He has clearly indicated a desire to cause me pain, and humiliation....and I just don't find the idea attractive at all.

He has also made it clear that he has....some restroom related fetishes, the idea of which really grosses me out. 

More recently, he has become more aggressive in pursuing exploring these kinks with me. He threatens to leave me if I don't give in. I will not deny that he has gotten me to try filthy, filthy things in the past, but often afterwords, I feel horrible.. I feel dirty, and sometimes he makes me cry during sex with the things he says.
<bot>: we are sexually incompatible, but I don' t want to lose him. Is there any way I can save my marriage?