BBC Three meets people into ‘breath play', a potentially lethal sexual practice involving the restriction of oxygen to the brain. Why do they do it? What do our experts think?

BBC Three meets David, who has been practising chastity for over 100 days. Today he is being unlocked. He explains why he has chosen chastity, and our experts give their view.

BBC Three meets Sabrina who's looking for an extreme sexual experience where she has no safe word. She explains why she is taking the risk, and our experts give their view.