When the game ends, the player either loses the game if he failed to properly win over any of the girls, or "finishes" one of the girls, often by having sex with her, marrying her (as in Magical Date), and/or achieving eternal love.
This gives the games more replay value, since the player can focus on a different girl each time, trying to get a different ending.
The degree of sexual content varies, but may often include intercourse.
Sexually explicit dating sims may fall into the category of H Game or Eroge.
Games where the player character is female and potential objects of affection are male are known as Gx B or otome games.