most guys dont have a clue how to work it to make anal feel good for a girl and despite urban legend even real hung guys should have NO PROBLEM with giving a girl anal..but the ass must be worked properly....lets you give her oral, start playing with her ass, use ASTROGLIDE!! and finger her ass for a while,see if you can get maybe 2 fingers up there, then when you are fucking her from behind do it again and use your thumb also, by this time you should have NO PROBLEM and use ASTROGLIDE again, TONS of it when u stick it in and do it EASY!!! sometimes you have to stop as she collects herself the try againt o get it in all the way.
its not like the vagina when u feel the tip of your head goign in then you push it all the way in deep and the girl loves it..if you do that she will SCREAM trust me i made that mistake once or twice,..or.... lol
when i was a young teenager i was giving anal sex to my gf who was 13 yes lol we were some young ass kids doing crazy shit...and trust me her 13yr old ass was tighther than any girls ass on this board..so it can be done and done right if you follow the way i described.