One couple my wife and I enjoy swinging with was a Christian couple we met several years back, and still swinging with to this day. They were in their late 30s, and were consistent churchgoers. Long story short, we actually met them a swingers club.
Whenever they invite us over for sex, they would usually ask us to come over for "bible study", of course my wife and I knew what that meant. Now they have kids, just like us, so they obviously had to drop them off at one of their relatives or friends place, before we do the "bible study". Yes, we did read and study some parts of the bible at their place, but it wasn't very long. What we liked about it was that we were always nude when studying with them. After studying, we finally get to having sex with them. Personally, I found it sexy when the Christian wife was praying quietly in my ear while I was penetrating her. If it was a Saturday, we spend the night with them, and they invite us to go to church with them the next morning.