There are at least two situations when threesome sex is good. It's when a couple wants to spice up sexual life or when inexperienced young people need to develop skills. It's a category where married couples find a third person for fun, or MILF joins teens for a threesome that is supposed to give them an unforgettable lesson. A threesome is a kind of sex that gives a lot of pleasure, believe all these people whose porn videos you are going to watch. When a girl doesn't satisfy her BF, it's time for changes.