How do I get my girlfriend to give me a blowjob?

Ask her very nicely after dinner, chocolates and about three or four orgasms you've shook her to with your tongue. :-)

======== let me tell you about girls that will not suck your dick THEY WILL NOT DO IT AT ALL if your lucky you can get them to do it 1 or 2 times but never is the way they are some thing happen to them when they were younger not to say a man made them suck him but something has made them the way they are you learn to live with it or go find a BJ somewere ..........i know my wife is that way and she ask her friends to suck me and 2 have did it or she tell me to go find a BJ someweare......SORRY BUT THE TRUE ABOUT GIRLS THAT DONT LIKE TO GIVE BJ's

Maybe unbelievelable vor many, but there girls in word who don't like blowjobs (and boys who don't like to lick).
It's okay to talk with here. But please do not try to convince her, or tell her that there are others doin it. It makes only fun if it is fun for her as well.

you give her one first!!lol JK but seriously just tell her that u want to take ur relationship to the next level=)

talk to her about it.
if she doesnt roll like that, then respect her wishes/beliefs.
if she wants to and hasnt done it before be VERY kind
and make sure you return the favor.
and also encourage her and tell her what you liked the best.
because I am in the same boat as...her maybe?
I am sort of new at this too.
but I am getting a LOT better. lol ;]
and if she IS experienced, then...seduce her?
just turn her on. whisper dirty things in her ear.
oh. and be sure to moan in her ear too.
she will want to pleasure you like NO other.
hope this helps.

It's like asking how to build a car. It depends on who are you starting with. Not every girl should be approached the same way, but there are some general tips:
Get a girl who loves giving head, ok thats the easiest start but hardest girl to find.
If thats not the case then get your girl to love you or feel very addicted to you in any way.
Fu*k her like mad. That would be the easiest way to make her addicted to you, oldest way and never fails. Good sex is always cool. Next give her oral, well that's not so much for reciprocating but more like getting to know every inch of her body, so next logical step is for her to do the same. And the most important rule don't be stupid and demand it from her, because you will never get it then. Other thing if she starts going down, DO NOT push her head, or force her. Its not that simple, but there is a site that sums it all up Jacks blowjob persuasion. Good luck dude.