What is a threesome and What to do in it?

 What is threesome dating? Of course, in theory, we can imagine, but what is the nature of this activity, what is its purpose? Recently, more and more newspapers and the Internet contain advertisements such as "a married couple is looking for a man or a woman for a regular meeting" or "looking for a couple m + w for lovemaking". Why do people seek third person? The answer is simple - they want variety. Contrary to popular belief, the threesome is the fantasy of many women as well as men. Of course, it's best if it's completely free.