sentences:  Between adults, it sometimes functions as an outlet for sexual energy, with erotic games, foreplay and sex being the primary methods of doing such.Some people take part in tickling games or contests which test their endurance to being tickled, for amusement, erotic pleasure, or other reasons.These games may involve some form of physical restraint of the person to be tickled to prevent them protecting the ticklish spots or otherwise interfering with the game.