This all reminds me of the subjectivity of sexual harassment. There are few "clear cut" cases of sexual harassment, since it's defined as unwanted sexual attention as perceived by the recipient or observer. So a married couple kissing goodbye in the office could be considered sexual harassment to an overly sensitive onlooker, whereas even an ass slap could be considered just good fun if all participants and observers see it that way.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker