Excuse me! A bad plot line always spoils the mood for me.
Many years ago, when I watched that sort of thing, I had an adult film where a couple was getting it on. If course the camera zoomed in on the point of coupling. when the camera zoomed out, the couple had this blank look on their faces for about 5 seconds, then realized their faces were in the film, and immediately adopted a look of lustful ecstasy.
I know what you mean... a plot always spoils it for me, too...