both (man & woman) have (relatively) young body but old & ugly face. Man with big cock, woman with beautiful hairy pussy. It seems to me that they are husband & wife.
Oh, my friend, I prefer pussy everytime when it possible, just like you. Here I see some reasons. Anal gives her more deep orgasm or her pussy tired (for her). Her asshole more tight (for him).
Ella https://www.iafd.com/person.rme/perfid=elenasugar/gender=f/elena-sugar.htm