> So why is it acceptable to grope someone just because of what they do for a living?
As he described it, it was an accident. I did the same a month ago, hugging (and being hugged by) a friend goodbye - she was wearing a backpack and so to complete the gesture my hand had to be lower on her back than it normally would be, accidentally brushed her bum on the way to the small of her back. In no way could it have been mistaken for a grope, a grab or a slap, and she didn't appear to notice - even though I felt a small, inward pang of embarrassment.
It's no fun for me to touch any part of a woman she doesn't want me to touch, but if you're respectful and not bad looking many a woman may grab your hand and place it on her body. The thrill is in her expression of intent more than the tactile feeling. Intent is important.
Hugs don't always go smoothly - if I have facial stubble, it will sometimes catch on a woman's hair and pull some strands towards me as we part.
Then there is there is the question of whether to do two cheek kisses (the norm in France, Spain and other countries) or just one... we just have to go by context, and most of the time we get it right. Abashed giggles on both sides is usually the result if we don't. In some contexts, friends will kiss each other on the lips; I don't instigate it but some women (and men from some cultures) will.
We're strange creatures.