What's the most non-sexual thing someone has done during sex that has annoyed you?

Was there ever a big disconnect between how aesthetic a scene looked on film, vs. how it was to actually film said scene? Or is it more of a what-you-see-is-how-it-was, type thing?
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"You know your girl's a slut when she's doing the two-hand, twisty-turny." -Gia Jordan