Pain as an insurmountable barrier to anal intercourse is consistent with the study by Stulhofer and Adkukovic.
For example, some of the women agreed to have anal intercourse in exchange for money: I tried it a couple of times, but I got paid a very large amount of money.
Personally, I like it; I wanted the ultimate workout and he gave it to me; I do like to have my salad tossed.