関連ワード:  what is the purpose of courtship    what is the purpose of courtship behaviors    what is the purpose of courtship behavior in animals    what is the purpose of courtship jw org    what is the purpose of courtship in animals    what is the purpose of courtship rituals    what is the main purpose of courtship    what is the primary purpose of courtship behavior in animals    what is the primary purpose of courtship in a relationship    what is the goal of courtship