How do you ''intellectually stimulate'' a guy?

I don't think of myself as stupid in the least, but I'm not a dictionary either. Does intellectually stimulating mean to interest him without being sexual? Like talking about his interests? Little bit confused. I posted the one about the Aquarius, so. This guy is Aquarius :)
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+1 y
What questions should I ask him about. Don't know how to approach it.

I'm new at this, examples greatly appreciated :)
How do you ''intellectually stimulate'' a guy?
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