Girls, My girlfriend likes sitting on my lap?

Anonymous
I want her to stop, but I don't know how to tell her. You see, my girlfriend likes to sit on my lap. It's nice, I guess, but she tends to sit sort of... high up and she tends to jump on my lap fairly quickly when I'm not expecting it. Sometimes it happens, sometimes it doesn't, but she hurts me, like A TON... in all the most sensitive parts. So if it happens, I have to quickly usher her off to either curl up in the chair or on the ground, and it IS a small chance this happens, but since she does it so often, it has happened more than I can pass it off. BUUUT, I still like it when she sits on my lap, just cuz it's affectionate and whatnot.

Explaining it is a bit awkward since she doesn't like me mentioning anything "sexual" even though this isn't sexual. So, how do I tell her to stop, but NOT tell her to stop?
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And the reason why she didn't notice it before is because she grew up in a kind of sheltering family (they're slightly more lax now but still sort of sheltering), so she innocently thinks that the reason why I get hurt is because she backed into my stomach (but it's a whole lot worse). But if I so much as say "balls" she thinks I'm trying to be inappropriate and gets mad at me.
Girls, My girlfriend likes sitting on my lap?
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