How bout (for the pervs obviously) a really fit woman top half (eg angie jolie) and a variety of animal bottoms. So you could have a dog bottom and get to **** a different type of vagina (or arse) but it'd be amazing and guilt free cos of the top half. Then you could try a pig bottom half and see how that vagina is, and so on...
...
Well it'd be an experience at the very least.