Why don't some guys kiss during casual hookups?

caligirl03
My guy friend who can be a bit of playboy when single says he doesn't kiss any girls he casually hooks up with on the mouth and reserves that for when he's seriously dating someone.

As someone who's kissed a lot of guys but not had sex with them as I see sex as much more intimate than just bumping lips, this opposite mentality is interesting to me.

Why no kissing? Anyone else out there like that?
Why don't some guys kiss during casual hookups?
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