Wifeswapping destroyed marriage

Branson says in Losing My Virginity that his first wife, Kristen, left him due to experiments with open marriage. Branson and Kristen have dinner on his houseboat with Soft Machine band member Kevin Ayers and Ayers’s wife:

We soon found ourselves chatting on two separate sofas and then kissing. Then Kevin and Kristen went off to his bedroom while his wife and I stayed on the sofa. Kristen was successful. It was clear something amazing happened between her and Kevin that night. But I failed miserably with Kevin’s wife.

Ayers and Kristen start a relationship and move to Greece:

What had started as a harmless bit of fun ended in Kristen leaving me and moving in with Kevin.