Focusing JUST on the physical sensations, what's your favorite position? Exclude visual stimuli (seeing her boobs/butt, watching her touch herself, seeing her face, etc.) and such and focus just what feels best on your cock.
The reason I ask is since my divorce, it seems like my partners have all really liked to put my ankles on their shoulders while I'm on my back, practically folding me in half. It's not my favorite for a couple reasons... my hips aren't as flexible as I age and primarily because it feels like he's more likely to "bottom out". Sometimes, this is good, other times it's an ouch. I can't imagine that this is a position that I look particularly sexy since practically everyone has belly rolls when bent in two, so I'm guessing it feels particularly good. What say you? What feels best?