Wasn’t me… [/Shaggy]
And you meant to say it this way?
-It’s not cheating if you and your SO are in different zip codes.
-It’s not cheating if you think about your SO when gittin’ it on.
-It’s not cheating if you blame the President afterwards.
-It’s not cheating if you make your mistress wear a paper bag that has a picture of your SO on it.
-It’s not cheating if you’re only doing some crazy, kinky, nasty sex thing that your SO doesn’t like. But you better make sure she doesn’t like it first.
-It’s not cheating if you dump your SO the next day.
As one of my old ad guys used to declare before road trips…
“Blow jobs and on the road don’t count.”
It’s not cheating if you’re so drunk you can’t remember it.
What you can’t remember never really happened.
Uuuuhm, you know, just out of curiosity, sor 'o fing, which proposition depends on the woman.
Are you saying that a man’s enjoyment of cunnilingus depends on the woman, or are you waying that a womans enjoyment of fellatio depends on the woman? If it is the second one, can you give us an example? You know, in the name of science?
Its not cheating if the “other” partner has at least 20% DNA compatibility with your SO.
Its not cheating if you have permission from your SO.
And of course, the serious answer is…
Its cheating if it causes your SO pain of any sort whatsoever.
It’s not cheating if you can’t get the same activity at home.
It’s not cheating if your SO is present and cheering you on.
It’s not cheating if it turns out to actually be your SO in disguise.
It’s not cheating if you get paid a lot for it and then spend it on your SO. (Well, okay, that’s still cheating, but it might make you feel better about it)
It’s not cheating if you’re playing with the optional Illuminati rule that says it’s okay if you get away with it.
It’s not cheating if your SO knows that it’s part of your regular duties at your day job. But the film crew is off limits.
What is it with you and tongues? 
It’s not cheating if your husband makes you both waffles when he finds out.
It’s not cheating if:
it’s phone sex / text sex / online sex.
it’s with two girls/guys at the same time, because they cancel each other out.
it’s on New Year’s Eve (I don’t remember who told me that one)
BTW, I did mean cunnilingus when I said giving head. I don’t think I know any guy that does give head, and doesn’t enjoy it. Do any women actually enjoy giving blowjobs?
Yes. But I can’t tell you how I know that.
It’s not cheating if your SO knows about it.
It’s not cheating if the person is a different sex then you SO.
'Course. Silly question. That’s like asking “Do any men actually enjoy going down on a woman?” (and trust me, there are some who don’t…) 
It’s not cheating if it was really, really, amazingly bad.
Though I do give head, I don’t particularily enjoy it. And I had girlfriends who did enjoy giving blowjobs. You shouldn’t assume that everybody is turned on by the same things.
And to answer the OP : It’s not cheating when you don’t lie or hide the truth.
It’s not cheating if you dump your SO, then sleep with someone else, then get back together with your SO.
(Especially if you wern’t planning to get back with your SO)
Then it’s just kind of sad.
It’s not cheating if its with a blood relative. (one of your blood relatives, not your spouse)
It’s not cheating if your SO is in the room, behind the camera.
It’s not cheating if it’s with your hand.
It’s not cheating if it’s with a robot.
It’s not cheating if your SO joins in.
It’s not cheating if it’s with an ailen.
It’s not cheating if it’s with a chimp.
It’s not cheating if American soldiers force you to in an Iraqi prison camp while photographing it.
It’s not cheating if you do it while sleepwalking (especially if you’re dreaming about your SO).
It is cheating if you do your SO while sleepwalking and dreaming about another person, though.