I am a guy and it didn't happen with me. It happened with two girls in a public bus three years back.
I took a bus from my residence in Sector 29 of Vashi. I was standing and a guy was standing beside me and there were two girls standing on the opposite side of the aisle. The guy was around 25-26 years at that time I guess. And I was 22. Then, after a few stops, that guy slowly went on the other side, right between the two girls even when there was a lot of space on this side. No one except me apparently noticed this. Slowly, he tried to hold one of the pipes in the bus to 'support himself' where he actually was trying to touch the hand of one of the girls. But, the girl soon became aware of this and she removed her hand from there. After some time, that guy brought his hand down and started trying to 'inadvertently' touch the other girl on and around her thighs. The girl was unaware of this. But, I told him loudly, 'Why do you stand there in the narrow space between two girls when there is enough space over this side and I've been seeing you for quite some time that you're trying to touch this girl on her hand and this girl on thigh.' The two girls and a few passengers around heard them and the guy started defending himself. He in fact argued, 'Is ladkiya kuch nahi bol rahi hain t tu kyu bol raha hain. Maine kuch nahi kiya'. I replied that they even aren't aware of it. I kept on making him feel ashamed. Eventually, he got down at the next bus-stop.
* "If the girl isn't saying a thing, why are you? I didn't do anything."
Location: A public bus (BEST?), Vashi, Navi Mumbai