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No. 3281
You'd probably be sure. But I'm not you so I can't say for certain.
Try this: when you feel like you're about to cum, pull out and stroke yourself and cum onto her stomach (or back, depending...). Then you'll know.
Or wear a condom. If you think you might have just orgasmed, you can always check the reservoir and if it's full of semen, well then you'll know. Just remember to change the condom before going again.
Also, I hope your girlfriend is on birth control if you're cumming in her.
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