I trust my husband, he trusts me. But, neither of us would be comfortable with this.
Humans have a design flaw. Fallibility.
Post party buzz+Possible tipseyness lowering inhibitions+novelty of initimate setting. I wouldn't chance it. Not for him, not for me.
We have a different sort of trust deal. It's based on the principle of run at the first minor frisson. Becuase we are married, not dead, so it's not realistic to assume neither of us will ever have a sexual feeling for anybody else, ever again. Sexual urges can be powerful and IMO the safest, most reliable route is to be utterly steely at the start, when it is still relatively easy to shut them down and close off any dabbling on the edges of Lake Temptation.
"I Trust You" only takes you so far, I think it needs more of a hand in keeping it upright than maybe other people do. I'd rather we trusted each other to have the good sense to step away soonest possible and actively avoid situations that might lend themselves to getting carried away if the wrong factors eased common sense off the balcony.
Pleanty of formerly solid couples have gone kaputt becuase of trust being a bit too porous in the face of something that was practically designed to bring out an imperfect human's feet of clay.
You have instincts gnawing at you? They are there for a reason. Trust them.
Chances are, nothing would happen. But even the most robust relationships can stand for a little mollycoddling. Just to give a helping hand in getting it through life's already bumpy roads ... without any additional, unnecessary stress and strains testing its limits.