Can be a bit of both or just one or the other depending on the Top and situation. I have had an anal orgasm with a smaller Top I wasn’t particularly attracted to because his cock hit THE spot. Totally physically response. Other Tops have turned me on so much, from their looks, demeanor, words etc that I was cumming damn near a minute to being on their cock. So it could one or the other or a combination. Just enjoy it and don’t over think it, because it is awesome.