Midnight, you simply got married to a woman who fit the nice, respectful, good mother type in the 60's. I'd guess that you both took the conservative road avoiding the 'love in' generation of the 60's, the partying 'disco' era of the 70's, the 'new wave' generation during the 80's, the Seattle styled grunge band era of the '90's, which all typified some wild times and open thinking.
While you saw all the headlines of some wild times during those era's, you lived up to 'society's good guy' facade, but deep down wished you could have sewed your wild oats.
Now you are older and feeling like your time here is getting short, so want to indulge in what you missed out on, wild times that passed you by, and you want your life long partner to change to accompany you on your exploration.
Here's the way view it; you should have put much more emphasis on finding a partner that appreciated sex, was more open about it and was a bit wilder 40+ YEARS AGO. That would have been the time to say to your fiance (now your wife) "I just do not feel like we're on the same playing field," then break up.
Like I said, THAT was the time to choose your compatible partner, but that time has passed, and you made your bed, and now must choose to lie in it, or possibly be without a companion until you expire, by pushing the issue.
Considering what everyone else has reported, namely that you've been venting on this board for years about your short end of the stick, I borrow a theme, regarding your wife and your marriage, from Shawshank Redemption: "get busy accepting or get busy separating."