"Therefore, women's infidelity has grown to be considered more serious than men's infidelity."
Depends on who's doing the considering, eh? But I was talking more about premarital sex. Men don't generally look to marry a "whore" or a "slut". But those are just labels. A woman won't be called a slut if the quantity of her premarital sex partners isn't common knowledge. If she looks and acts proper then she's a good woman. Once the news of her sex habits becomes known... presto-changeo... she's a slut. There is no corresponding label for men. "Stud" isn't considered an insult. That's what I find strange. It's amazing how differently men's and women's sex habits are viewed.
As far as after marriage, well, you either take your vows seriously or you don't.
How about "slutpuppy" or "horndog"? Or "Clinton"? ;-)