Friends with benefits are essentially two friends who turn to each other when they need to satisfy their carnal needs. However, such friends don't harbour--or sometimes suppress--romantic feelings towards one another.
In other words, the concept of friends with benefits works best when there's no emotional commitment in a relationship and the focus is purely on sex. While such friends are not exclusive, they do have a few ground rules that--as one can imagine--are rather tough to follow.
Most often than not, such a situation gets complex when either party begins to develop feelings deeper than just friendship. This is only natural considering the fact that sex is more than just a physical process and it involves opening up emotionally on an intimate level as well.
Having said that, this concept has become very popular around the globe in recent years. This is especially true in big cities, where people with busy fast-paced lives don't have the time to nurture serious relationships. Satisfying their sexual needs without any strings attached works best for such people.
On paper, this might seem like an ideal solution for many but in reality, this seldom works out. In the long run, one of the two friends ends up getting hurt--and it ruins a perfectly good friendship.
So, in case you're thinking about getting--or already are--in a 'friends with benefits' situation, ensure you've analyzed both sides of the coin!