[llblovesejw]

Seriously, just tell her how much you enjoy oral sex (FROM HER) and how you wish she would do it more. Tell her you would reciprocate ten-fold.
Don't forget though, you married her because you love her (I'm assuming). Why would you over-ride that and go outside that relationship just to get a blowjob? If she's not comfortable with it (and if she's uncomfortable, ask her why), tell her it's okay.
Be a man.
Talk to your wife about your wants/needs, brother.