For many performers and viewers, anal sex is always a thrill. You know what's even more fun? When the action makes milady's bunghole gape! Such sphincter stretching is fascinating physiology, not to mention a window into a woman's ... well, if not her soul, into her internal anatomy at the very least. Often, that open chasm looks like a dark cavern; other times, a gaping anus provides a view of nasty red intestinal innards. Big cocks aren't required--fans that prefer to look at women only can ge...