Well, i found this video from BuzzFeed.

I think this is a special chair indeed. It is called "Salli Saddle Chair". The Divided Salli Saddle Chair Seat is an ergonomically designed chair for your genitals. It has a gap in the middle to take the pressure off of your sensitive genitals. They say you should try it without underwear, because it is most comfortable…. For your genitals.