I am turned off when while watching porn I think "oh, poor little girl" and feel suffer towards her. I can't stand when a girl is having sex with a mixture of aversion and ******* on her face. Anal sex can be great. But it can be done in such a ****** and ugly way, especially when girl is not enough trained and not enough lustful/willing, that become the biggest turn off.
I love when I can't determine whether a girl is really having pleasure, or whether she is just playing it so good. There are some extra cute chicks, that have amazing faces and bodies, and they act like they are the most lewd in the world, getting a fat dick deep up in their ass, and their ass itself looks like it can hold a ballistic missile inside, and the whole process of penetrating does not arouse any thoughts about pain or ******** - it just looks like great lustful sex.
So, when it comes to anal sex we need:
beautiful girl;
her beautiful ass with beautiful clean flexible asshole;
a lot of lust and hunger on girls face, not to think about her as about a victim, but as for a hungry, crazy & wicked lover;
and it won't be a turn off