Not simply a man who's wife/girlfriend cheats on him, but rather a man who actually gets aroused
by knowing or seeing her in sexual situations
with other men, such as flirting, kissing, fondling, or sex. In particular, situations
where he is NOT participating but instead marginalized, just observing, or even completely ignored.
You should have seen Frank
smiling as his wife was flirting with other
men at the club, even allowing them to grope her; I swear it was giving that crazy cuckhold a hard-on