I was reading through the "Snooping" thread and really liked it - check it out if it's your sort of thing. Anyway, it got me to thinking about people getting away with something right under their wife's nose. I'm not talking about fucking someone else when she's okay with it - my hats off to you that are able to arrange that with your wives, but it's not happening for the majority of us - I'm talking about something sexual that's happening right in front of her and she's not aware... or at least doesn't get angry about it.
Some background: my wife is intensely possessive and jealous - although we've had some light discussions about a threesome, which I don't believe is ever going to happen. She doesn't want to share me and claims she's not turned on by other men (or women) and I don't want to share her with another man (no problem with another woman hopping into the mix

If I so much as look at another woman, there is going to be trouble and lots of it.
Still, I've been able to sniff two other women's panties right in front of her without her getting angry with me. My wife knows I like to sniff her used panties on occasion (she's convinced herself that it's limited to her panties, I guess) and enjoys when I do it. My SIL (I've written about her here) stayed with us for several weeks and left some things behind when she went home. I found a jacket and other items of clothes inside the garage a couple of days after she left and something (general horniness for her, probably) made me search the pockets - bingo! A pair of her panties with her pussy scent on them. I spent a lot of extra time in the garage the next couple days "working on things." Finally, my wife brought the clothes inside to bag them up for storage and left them on top of the table. The jacket was on top, with panties in the exposed pocket. I engaged her in conversation and while we were talking, I curiously looked into the bag. When she didn't immediately say anything about them being her sister's, I "found" the panties and said something about her having a pair I'd never seen and immediately lifted them to my face and inhaled deeply. My wife shrieked that they were her sister's and I stopped, while trying to hide my erection behind the chair. Great sex that night - my wife didn't like that I'd sniffed her sister's panties at all, but she didn't fault me for the "mistake."
Second time was similar, but with the leotard/unitard my wife's redheaded work friend used to work out in that afternoon at the gym. I knew they'd done yoga together and the friend had to borrow an outfit from my wife. She even left a red pube in it to tip me off. My wife dropped the outfit on the laundry pile and told me she needed a shower because she was all sweaty. I told her I like her sweaty and then I simply lifted the outfit off the top of the laundry pile and put it to my face, drinking in the scent. Again, my wife yelled for me to stop, that they weren't hers, etc. but I'd already had my fun. I ambushed her in the shower and we fucked right there - she may have suspected I was turned on by her friend's scent but didn't mention it. On a side note, my wife's work friend was bisexual and was really hot for my wife. I tried to set up a 3 way between us all but failed miserably. lol.
I've never cheated on my wife, but I have snooped, spied, etc and I also got away with sniffing two women's pussies (well, at least their used panties) right in front of her without catching trouble. What's your story?