In my view, your gf is unreasonable with getting angry about it. You asked her to do something you like, that's all, she shouldn't have blew up over it. If she wasn't into it, she could have expressed herself maturely, or even just tried it to see if she liked it too. Maybe you should express in a calm mature manner that you were hurt by her anger and that you love her and felt that you could open up to her. Maybe you can do something for her that she likes, tit for tat.

I would imagine that she is feeling a bit THREATENED at this point. You're a guy, she's a girl. She doesn't come naturally equipped with what you have said you would like to have.... Add to her emotional mix...that most people are kinda "taught" that anal sex is a big taboo! Most people don't feel real comfortable even talking about anal and pleasure in the same sentence...let along considering the two in the same ACTION. She may now be afraid that you are Bi-sexual or Gay and that it's only a matter of time before you dump her for a guy! (and she may be right about this...or NOT, you may simply be comfortable with yourself and sex to the point that you are happy to consider the little nerve ending that dwell around your asshole and what they can do to stimulate you sexually...it doesn't mean you are gay....in my opinion, only that you are aware and comfortable with it.) Once more...it comes down to a long talk...which might be a challenge for her...or may serve to show her that you DO CARE about her feelings and that you want to understand why it upset her... I'd say DON'T use the talk as a "convince her to do it" but more as an opportunity to understand each other's feelings better...hopefully she'll be willing to participate in talking about it all. Good luck!

get down on your knees and beg forgivness as well as beg for the strapon

i think it is good for you that you expressed yourself. you sared your feelings with her give her time to understand. she must love you for what you are.

what the fuck

You should sit down with her and talk about things that turns you both on and be open about fantasies.. She is bound to have a fantasy that you might not be keen on doing, there is nothing wrong with wanting to be penetrated by your GF. My GF was also shocked when I asked for this but once you have told her that you like the idea of this she wont forget and The best thing to do is play with her ass during forplay ( 69 possition is great for this) and if she is really horny she might do the same to yours, then introduce small dildos for anall penetration, afterall dildos are better than fingers as they are smooth... Once you have done this alot of times the idea of her using a strapon might not sound to bad to her.

You have to have a serious discussion about it now. Just explain the simple truth how it's fun, healthy and probably the best orgasm you will ever have. There isn't anything wrong with it. She is probably bothered by the hangups and wivestales she grew up with in regards to guys having things in their ass. Take the Prostate Health road. It worked for me.