Here's the god's honest truth.
If you have had sex with eleven women, and did not stimulate their clitoris during intercourse, and they did not stimulate their clitoris during intercourse, and they still had an orgasm...there's a HUGE chance at least most of the women you've slept with are faking it.
Why? Because young men don't like to stimulate a woman properly, for whatever reason. And women are embarrassed to admit that the vagina isn't sensitive enough for their pleasure most of the time. Porn is a HUGE factor in this, since clitoral stimulation is minimal or nil and fake orgasms abound.
This is not a slap on you. Most men have NO IDEA how important the clitoris is to a woman's pleasure because of a variety of reasons, but it is. Saying that you're SURE the women you've slept with can orgasm without it is possible, but REALLY HIGHLY UNLIKELY!
I'm not trying to be disrespectful of you, but saying things like you want to 'wean' a girl off clitoral stimulation is really ignorant, because would YOU want to be 'weaned' of penile stimulation during intimacy? If a woman you're with orgasms through clitoral stimulation there is NO NEED to futz with her pleasure. If it ain't broke, don't fix it!
There has been a lot of heat in this thread and I've had to leave and calm down before posting more than once, I'll admit. But you've got to understand the majority of people that have posted here have told you the SAME thing, and that really -should- count for something to you. The clitoris IS the female penis, and if you like stimulation to your penis and don't want someone messing around with how you get your pleasure, DON'T DO IT TO SOMEONE ELSE!
I think we should locate this girlfriend... and convince her to "wean" him off of receiving oral sex from her... of course, he most likely can get off during intercourse... but why not remove the variety in the closest manner we can come up with.....