 (2) Clear cases of sexual obligations exist in relationships (though the obligations are likely imperfect) because sexual activity is an expected and crucial aspect of (especially monogamous) relationships. Note that ordinarily threatening harm to someone unless they have sex is morally wrong, but threats to end a relationship unless the other party has sex (“Have sex with me or I will break up with you”) are not obviously wrong, further indicating that sexual obligations exist (Anderson 2013; Soble 2017a; Wertheimer 2003: ch. 12).