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Sexual coercion in romantic relationships is a facet of criminal behaviour requiring psychological investigation. The cuckoldry risk hypothesis, that sexual coercion is a tactic used by some males to reduce the risk of cuckoldry by engaging in sperm competition, was developed to account for such behaviour. From this hypothesis, four predictions were generated and empirically tested:(1) males should be more willing to use sexually coercive tactics when the risk of cuckoldry is high;(2) greater instances of cuckoldry risk in the past should be related to greater instances of sexual aggression;(3) cuckoldry risk and sexual jealousy should positively correlate in men; and (4) among males, rape attitudes and arousal are highest when the risk of cuckoldry is high. Theoretical considerations also suggested the following exploratory questions:(1) are factors currently known to be related to general sexual coercion also related to measures of coercion in romantic relationships; and (2) can the cuckoldry risk measures still predict coercion after controlling for psychopathy? In order to test these predictions, a sample of 82 male and 82 female undergraduate students who were sexually active in a heterosexual relationship completed a survey that collected information on demographics, relationship characteristics, arousal, antisociality, and attitudes. Results found:(1) a significant interaction between cuckoldry risk variables in predicting coercion among male participants and not among females;(2) no relationship between past instances of cuckoldry risk and instances of sexual aggression;(3) those who spend proportionally less time away from their partner were …