I wouldn't marry the type of girl I would have a fling with.
I pity the future wives of every male who says this...
I pity the guy. It sounds like he wants to marry a prim, joyless bitch, who will reluctantly agree to procreate in the missionary position once a year with the lights off.
I don't pity people who get what they want. If a woman starts out a prim joyless bitch and the guy says "That's the one for me!" then he can live with what he chose. If she starts out vivacious, fun, and sex-loving but turns into a prim joyless bitch,
then I'll have sympathy for him. But mainly, what "I wouldn't marry the type of girl I would have a fling with" says is "I don't think vivacious, fun, and sex-loving women are good enough to marry, so I'll marry the prim joyless one and eventually cheat on her with the fun one because I feel unfulfilled with the marble statue I chose. "
Otherwise known as the Madonna/Whore complex, because some people are unable to wrap their minds around "good" and "good in bed" being the same person. I say "person" because women get that too sometimes, though men seem to more often.
Plus, Diogenes, it takes two people to have a fling. If a fling makes her a whore, it makes you one as well.