We have all been touched by a stranger (okay, not you, congratulations, lucky), whether on public transport, on the street, in a nightclub, at work or.... This is what men are like who send pictures of their penis and why women hate them.
Because it is a 'normalized' abuse. A 'drink' that most of the time is lived in silence in order not to mount a scandal. On multiple occasions you do not know who it has been (that's why it is practiced so much)