Partly it's shyness, but it for me it would also be partly "let her live in peace!" A porn girl you run into the grocery store might not want to talk to adoring fans right then, especially if mom and dad are with them over in the next aisle.

I guess the idea is that I don't know of it's inconvenient or uncomfortable at that time or not, and it's not my decision to make.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock