How many times have we heard this song?
Dude, every married guy on here (ok, well most) have walked in your shoes. Hell, there was a guy on another site who was singing that song after 3 weeks lol.
"Ok, it's me, I'm the one with problem! Issue closed"
SOrry, if she was my partner the first words out of my mouth would be: sorry, case is NOT closed. Not until we start to seek professional help.
Now I will ask you this: how often do you want it?
Another thing you have to realize: men and women view sex in different ways. Many (most?) women see sex as a way to "get" a guy and once gotten, then they figure why? Unbeknownst to them, if they use sex to GET a guy, they have to use sex to KEEP the guy.
How is the rest of the relationship? Are there kids involved? Is she your best friend? Do you have open and honest communication on other topics? and most importantly: Can you live without her?
I see any relationship is a 3 way situation; You have intellectual compatibility, you have emotional compatibility and you have physical compatibility. For any relationship to work you have to have at least 2 very strong parts to make up for the lack of a 3rd. If you're not in sync emotionally (madly in love with each other for eg) and you can't talk to her about things that interest you, then dude, time to get out now while you still can.
If you have two really strong points, everything is perfect except for the sex part, then see escorts. If the subject ever comes up again say: I want all these things with YOU, if you don't want them with me then what do you want ME to do?
BTW: sex therapy can help her overcome her hangups in regards to sex. Now if you're talking ball gags and playing pony boy, that's a little different but if you just want a healthy sex life, then that's not too much to ask.....