 In this case, "yaoi" is used to describe titles that primarily feature sexually explicit themes and sex scenes, while "shōnen-ai" is used to describe titles that focus primarily on romance and omit explicit sexual content, although sexual acts may be implied.According to this use of the terms, "Gravitation" would be considered "shōnen-ai" due to its focus on the characters' careers rather than their love life.The two participants in a "yaoi" relationship (and to a lesser extent in "yuri") are often referred to as and .