Because three is not an audience!
Most of us have actually dreams — some of these involve our partner, individuals we meet every single day, strangers — although not all dreams, or intimate encounters, are between two different people. Intercourse is playtime and several of us want to fool around with two different people into the time that is same!
A threesome ensures that you will find three individuals playing within the bed room (thus, the title). It could be a proven few inviting another feminine, also known as a unicorn because of her mythical rarity, to relax and play or they could ask a supplementary male to the room.