How do you get a girl to go anal?

Ask her and discuss it with her. If she says no, that is it. It might not be something she is aroused by and she knows it will hurt. If you want her to try it on you with a dildo maybe she will do that for you. but bring this up before you have sex with her so there is no pressure when you lie there naked. It will ruin a perfect moment.

First, have sex with her. then after sex go around behind her and rub her butt and squease it rubbing your penis against her butt. she should be ok with it then