Why aren’t promiscuous men also whores, men of loose morals, etc? The double standard is annoying.
Men also don't tend to bond irrevocably through sex; not as quickly as women.
Look at this this way -- a couple, Roger and Karen.
Karen discovers Roger has been cheating on her.
"Roger, how *could* you!!?"
"Believe me, babe, it was just a fling, she meant nothing to me!"
But Roger discovers Karen has been cheating.
He doesn't even ask. They both know it's over.