I realize this is a very old thread but you question peaked my interest and I wanted to reply and give you my perspective on it. We've been married for 36 plus years and have evolved so far sexually in that time. We started out dabbling in the swinging lifestyle in our 30's and were hooked. We view it as a recreational activity we both enjoy and our interests lead us down several paths. We both have explored our bisexual side, her a lot sooner than me but I've been courious since my teens. Our adventures also lead us into BDSM and interracial play and we both soon discovered we preferred playing with black men. I'm CD'ing also developed about the same time and it seemed only natural to include it in our play. Now not ever BBC is into with playing with the hubby, but we've found several over time who do, I think for most of them it's a power trip to dominate the hubby while fucking the wife, and by cucking and even fucking the hubby, it's just one more step in domination. What we get out of it is the satisfaction of pleasing our bull and submitting to him. I don't get to go into gurl mode that often but when I do, I want to be treated like one. We're more like sisters than husband and wife when we're playing, working together to please our Bull and make sure he's getting the attention he deserves and expects. I know it's not something every Bull or every couple wants or expects, but for us it's what we enjoy, and after all we're all looking for pleasure in this lifestyle. For me personally, I'm most happy when a Bull has me in the position he wants me in and is breeding me just like a woman while she watches and encourages him to fuck me and make me his bitch. Hope that explains it, at least from our perspective.
LoL 
