Because putting bands on wagons is cool, especially when the members are tied up and can't go anywhere. Just be sure to throw a blanket over the bodies or something, say what's under is a sack of potatoes (That just so happens to wiggle).
I'm open to a lot of things, but my comfort zone usually involves medieval and modern settings, with varying degrees of realism and fantasy. I like to explore mature themes, not for the sake of sex, but just because I like it when a character has to actually stop and weigh their options.