I am west coast and full on coastal and i won't agree with you trying to label coastal urban married folk as being ok with this if that was their partner with someone else.
I simple cannot believe you, sorry. I am as far from a prude as anyone i have met and can still say if you are married and that woman is not your wife this 'hug from behind while CLEARLY AND UNDENYABLE having your hands over her breast' is not appropriate unless you are in an open marriage.
His hands are not on stomach or her shoulders and that is clearly her breasts.