Hello.
I'm unclear on why you have such a goal-oriented perspective about this. You say you're enjoying the sensations when your girlfriend touches you, and that's a good thing, isn't it? Perhaps you're so worried about this that now you've distracted yourself enough from the pleasure and focused on the goal so, of course, you're not having orgasms. The more you worry, the less your body will cooperate.
One question to ask yourself is do you have orgasms from other means, such as self-pleasuring? If so, you can be sure that either a) you're not getting enough stimulation from your partner's hand or mouth; or b) you're simply not turned enough by these activities to have an orgasm; or c) something is interfering with your ability to relax and let go.
It's important to remember that there’s no such thing as “normal” when it comes to sex, so don't try to fit yourself into some sort of "ideal." Not everyone orgasms from oral or manual stimulation.
Many men find that they don’t get strong enough stimulation from a mouth on their penis. It feels good; it’s just not what they need. And so what? Enjoy what the two of you have, and don’t look for things to worry about.
Here’s some information for you about oral sex and men: Most people think that going down on a man isn’t quite as complicated as going down on a woman. As in all aspects of sex, there is no one-size-fits-all technique. In other words, having your penis sucked on as though it were a popsicle may or may not be what drives you crazy.
Here are some things you might suggest your girlfriend try when going down on you; but please, before trying them, check in with her about whether she’s willing to be experimental. As your girlfriend if she might try these during oral sex:
• Caress his penis with one or both hands, with your breasts, or with any other parts of your body
• Lick his entire penis like an ice cream cone
• Lick the underside of his penis from the base to the tip
• Run your tongue under his coronal ridge (the bottom ridge of the helmet)
• Lick, caress or even tickle his testicles
• Use both hands while using your mouth (this will also help you control the depth of penetration)
• Pinch, twist or stroke his nipples
• Caress his anus—if he’s willing, try inserting a well-lubricated finger inside
She should also remember to keep a bit of saliva in her mouth while giving oral sex-- not a lot, but enough to supply a natural lubricant. Have fun and play safe. Good luck! Dr. J
Exactly the same thing here with me and my boyfriend, except we've been at it for almost two years. Advice would be nice.