I've been going out with my gf for about 7 months and we started having sex like 4 months ago. i was wondering if there was any good way of suggesting anal sex to her?
I'd suggest at one point when you guys are in the mood, shyly suggest it to her, as if it just occurred to you. If she says she's interested then go for it, if she says no, then at least you know. Also, some girls might never have tried it before, but are interested, just not quite ready. If she's interested but nervous, let her know that there's no pressure and she can have time to educate herself about such things.
while you're fingering her, start to rub her asshole a little bit, pay attention to her reactions...if she starts moving to give you more access...keep going, if not, let it settle for a bit.
Whatever you do don't do the "Whoops, wrong hole" approach. A girl's most valid arguement against anal is "Would like it if I did that to you?" Most guys pussy out and then drop the subject. You have to be prepared for that answer. Have a nice dildo or strap on for her to use on you and you are half way there. As far as bringing up the subject, try: Having a frank discussion about sex. If you can't talk about it then you guys are too repressed and have worse issues than getting in her backdoor. In the course of the discussion ask her flat out if she's interested in anal play. I respect a guy for being forthcoming with their desires, but then again that's me. Try taking a shower with her and "wash" all of her areas for her. Then lick her in all of her areas including the back door. see if she's eager for more play back there. Going shopping for sex toys and picking up a butt plug, anal beads, or any other butt toys and genuinely asking her opinion of trying it out. THe more serious the look on your face the more she won't think you are joking or just wanting to be the first on your block tap her back there. Good luck.