A guy might say that but i disagree. I think plenty of guys know their limits, i remember hanging around with all these truckies at an expo and went to a function afterwoods with 2 girls serving drinks. One was hot and the other average. They kept trying shit on the average girl and completely ignored the hot one knowing they had no chance. One even said that too me 'No-one has a chance with that'. Jacking off to one is different.
Disagree ... The term "Trophy girlfriend or wife"springs to mind
I know for a fact though a lot of women see a guy who's good looking and in shape and straight away say oh he's looking for a woman who spends all her time in the gym, he will be the gen in the relationship etc etc