Girls, should I let my boyfriend watch me pee?

I was really desperate to pee when I got home with my boyfriend yesterday. He asked if he could come to the bathroom and watch as he'd find it "sexy". I said no, and really all I could think about was having a pee. Anyway, he's asked before and I've said no, but I'm wondering if maybe I should? Is there any harm in that, anyone else been in this situation?
Girls, should I let my boyfriend watch me pee?
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