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Women who are really into semen might really enjoy getting a face full of it. If your girlfriend is up for this, give it a try. You might want to put a towel down first, since it might get messy. Exercise some common courtesy and let her know right before you pop one off. And be sure she closes her eyes before you shoot, because semen in the eyes can sting like hell. Have a hand towel or tissues ready for clean up afterwards. You might also suggest doing it in the shower, so it's quick and easy to wash off.
On the other hand, some women find the idea of getting drenched with cum disgusting and degrading. If your girlfriend feels this way, chances are you won't be able to talk her out of it. If she's on the fence, let her know what you'd like to do and see how she responds. Tell her it would be an incredible turn on for you, and talk your way through the scene beforehand, describing to her what you would do and what would happen when you blow your load all over her. Ideally this would get her hot enough that she'll start jacking you off right then and there.
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