How about ‘non-connubial nookie’ ?
Posted By Jeff on June 15, 2010
Which sounds worse, “cheater” or “adulterer” ? The former is pretty broad; the latter really only applies to marriage.
The there are verbs. “Strayed” sounds like something your dog does …
And the adjectives: “Extramarital sex” … “non-connubial nookie” (I kinda like that …)
“Unilateral non-monogamy” …
“Cheat” is probably the most common word for what we’re talking about. “Fucking around” is common but mainstream media won’t touch the “F” word.
Anyway, what have you got? Is there a killer word or phrase I’m missing, related to having sex with someone when you’ve promised sexual fidelity to someone else?
I thought of that when I ran across an article about how guys feel when their girls cheat on them.
When Women Cheat — What Four Guys Learned From Infidelity
All four guys kind of hated it. But in the online survey, about half the respondents indicate that infidelity is something that couples can overcome, depending on the circumstances.
The other half go ballistic, of course.
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"Into Temptation" has been a forum about evolving social-sexual networks and how they have changed and are changing lives. In other words, we talk about dating and sex. 
Steppin’ out!
Cuckolding!
Gettin’ some strange!
Creeping – hip hop term.
I’ll ask my playa pimp if he can think of any others.