Long ago, hubby and I agreed that if one of us was ever in the situation where we really wanted to have sex with someone else, it was ok. No prior approval, no notification, no subsequent debriefing required. We talk about (and listen to) sex in the same way we talk about everything else in our marriage. Sometimes all the details about the day at work, sometimes hardly any. Sometimes I describe a sexual interlude that I had with Red in detail, other times I mention it in passing. Or hubby will ask if I fucked Red, or whether Clair and I went down on each other today, just because he wants to know.
P.S. I've never used the hall pass. I'd be surprised if hubby has either, he doesn't hide anything, but it doesn't matter.