if it's for a one night stand, adventure and i'm not going to see the girl ever again then i'd definitely wouldn't care for ass size. If it's about a girl to get in a relationship with then it certainly has to be... oh no wait! i don't care again ! I don't care about her size. Her face (features, smile, eyes) counts a lot more for me to be interested in her. Her whole body has to be well proportioned.. Then charisma, attitude, character and she's in for the fun.