17 years together, do you think there is ANYTHING we haven't tried (within reason and physical limitations)? While anal isn't what I consider a "regular" menu item, I see nothing wrong with it.
Actually if anything that's worse, unpleasant mental imagery.
The wonderful thing about our world, Plank, variety is the spice of life. Imagine if everyone found the same type of person attractive, wanted to only do the same activities, drive exactly the same car, wear the same clothes and shoes, we might as well be robots.