Yes, I know when it's showing, or when it's in danger of showing. It's hard to find jeans that fit sometimes, as jeans that fit my butt tend to gap out at the waist, making for some embarrassing situations. Thankfully, longer shirts are in style now, so it tends to hide any reverse cleavage most of the time.
And no, I don't find it attractive. Plumbers come to mind...
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