I just think that any sort of content that suggests sexual intimacy should be placed at 18+. Thats usually how most producers rate their movies and why some industries are only for 18+. Only people who are 18 or older can consent to such acts, so content regarding that should be limited to that group. Like, you can teach about constant without being sexual, but this scene is both teaching about consent and being sexual. So as stated previously, I feel it should be limited to the group of people who can consent to such acts.