The same point you and I made earlier still applies. If everything else in your relationship is perfectly fine, it would be unwise to end it if it's lacking in just one area. The wise thing to do would be to look at the relationship as a whole and what you want out of it i.e. marriage, kids, etc. My guess is that guys are not satisfied with their sex lives as a whole i.e. not getting enough so greek isn't even on the table. You would have to have a pretty empty life if lack of greek for example, would be the only deciding factor to end a relationship.I have not. Perhaps I'm in the minority. But again, you are missing my point. I have no issue with a person who enters into a relationship in good faith, it goes downhill, and as a result he sees an SP because he is in a loveless, sexless marriage and he's tried to fix it to no avail. I don't think any good relationship starts with the notion of straying to solve any issues.
Let's choose Greek instead of DFK. You really enjoy Greek and your new GF indicates she doesn't like Greek and doesn't plan on changing her mind in the next 50 years. If your sexual satisfaction relies heavily on Greek, should you stay with this lady, marry her, and just see SP's to satisfy your desire for Greek? Or should you break it off early on and find someone else who enjoys Greek or is at least open to it?
If you're seeking an actual relationship, then there's always going to be something lacking. So either learn to deal with it or you're never going to be satisfied no matter how many relationships enter into.
If someone is unwilling to look at the big picture, then why enter into a relationship at all?