Why is my girlfriend obsessed with my balls?

My girlfriend loves to casually grab my balls. In everyday conversations, she makes offhand comments about my balls every now and then.

When she wants something from me, she sucks on my balls. If she doesn't get it she threatens to squeeze them (she's never done it)

But why can't she get over my balls?
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And... why are some women fascinated with their bf's crotch area?
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I'm not complaining or anything... just curious why!
Why is my girlfriend obsessed with my balls?
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