 Marriage is widely taken to have an amatory core, suggesting that a further marital promise is a promise to love, as expressed in wedding vows ‘to love and cherish’. But the possibility of such promises has met with skepticism. If one cannot control whether one loves, the maxim that ‘ought implies can’ entails that one cannot promise to love. One line of response has been to suggest that marriage involves a promise not to feel but to behave a certain way—to act in ways likely to sustain the relationship. But such reinterpretations of the marital promise face a problem: promises depend on what promisors intend to promise—and presumably most spouses do not intend to promise mere behavior (Martin 1993, Landau 2004, Wilson 1989, Mendus 1984, Brake 2012, Chapter 1; see also Kronqvist 2011). However, developing neuroenhancement technology promises to bring love under control through “love drugs” which would produce bonding hormones such as oxytocin. While the use of neuroenhancement to keep one’s vows raises questions about authenticity and the nature of love (as well as concerns regarding its use in abusive relationships), it is difficult to see how such technology morally differs from other love-sustaining devices such as romantic dinners—except that it is more likely to be effective (Savulescu and Sandberg 2008).