Is it normal to constantly think about someone when you start to become physically intimate?

I started dating very late in life. All I think about is her, us fooling around, feeling her body, and the look in her eyes while we were groping each other.

How do I stop these obsessive thoughts? We haven't slept together yet but I feel like when we do I'm just going to be even more preoccupied with the thought of her.

Is this normal?

Is it normal to constantly think about someone when you start to become physically intimate?
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