A recent survey of 1,815 Canadian adults found that about half of respondents saw a partner’s romantic companion use as infidelity, and roughly three-quarters said they would react negatively. Reactions to romantic companions were about as negative as reactions to dating apps and webcamming, and more negative than reactions to AI pornography and sex toys. Nearly two-thirds of AI romantic companion users kept their use from their partner. Cisgender women were about twice as likely as cis men to say romantic companion use counted as cheating. Gen Z participants also tended to react more negatively compared to older participants. Individuals in non-monogamous relationships were about half as likely as participants in committed monogamous relationships to perceive romantic companion use as infidelity. Higher social conservatism and religiosity were linked to stronger infidelity judgments. Surveys in the United States reveal that at least one in six adults reported interacting at least once with a romantic AI companion, and about one-third said a partner’s use would count as cheating. In another study of young adults in committed relationships, nearly two-thirds of regular users wished their partner behaved more like their AI companion.