Even though my wife has complete license, and my support to have sex whenever, and with whomever she pleases, she still enjoys cheating. I believe that she tells me about these encounters, at least the majority of them after the fact, although it can sometimes be days or weeks later.
I can generally tell if she's come home horny, and freshly-fucked - she too enjoys the illicit cream-pie "gifting," but for the most part I believe I know she's got a load of hot strange cum, and just play along with it.
My wife is very sexual, and sexually aggressive, more so when she's enjoying illicit encounters, which is one of the signs it's going on. I rarely challenge her on this matter - only if I think she's doing something that is too risky, living driving after drinking, or not following our health screening protocols.