Sex File: Should we make our threesome fantasy real? 

You may find that when you start discussing the specifics of a real interaction, as opposed to a Feeld fantasy, the idea loses some of its appeal.

The basic ground rules of threesomes are that both partners should have a clear understanding of each other's expectations, and if one person isn't 100% enthusiastic about the idea, you shouldn't do it. 

My wife and I have explored Feeld, the app popular with people in open relationships, a few times over a glass of wine. We're both up for trying a threesome with another woman, just as a one-off. She's more enthusiastic than I am and I'm worried it could be a minefield, particularly around jealousy. How do we establish boundaries before we get in the bedroom?

I've heard a lot of good things about Feeld and I know several - admittedly much younger - couples who met through it, but I've never checked it out myself. Until now.