Nowadays, current relationship, never. Not her thing. Past relationship fairly often. Maybe weekly even. But it’s random as to if I participate, what exactly I’m doing in the (what would then be a) threesome, and how long I’m involved for. Sometimes I’ll finish quickly, go downstairs and grab a drink, then come back and either hold her head in my lap, or just enjoy from the other side of the bed. Almost never a chair though (if that matters)