Milhouse did you come into this thread just to tell Tara she's using the same thing that the creators of family guy did? Or were you actually going to contribute your useful knowledge of anal sex? Considering your hatred of females, one might assume you would be gay. Not that its a bad thing or whatever, but you might be able to help the poor kid out.
Just a hunch..
Now to the idiot who apparently has to come onto a message board that is known for 'mocking' people, and ask how to get a girl to let him get all anal. I'm guessing you probably haven't even asked your gf if she is comfortable doing this. That might be a good start... Then if you two really need help then maybe
www.jackinworld.com can help .. or
www.adultfriendfinder.com who knows..