According to other Twitter users, this is not the first time the man has gone viral for sexually harassing other victims.

By Ivyna Ong

The meat of the challenge is not about gaining a higher testosterone level, but gaining self-control, said sexologist Dr Rachael Winston.

By Yap Wan Xiang

She recognised the carpeting in the background of the videos.

By katkazman

A witness posted the videos online that have since gone viral.

By Tamara Jayne