Social power can activate behavior toward goal attainment. In the context of romantic and sexual relationships, social power may facilitate competitor derogation tactics and self-promotion tactics to attract a partner. We hypothesized that perceived invulnerability to harm would provide a pathway linking social power to competitor derogation, whereas self-perceived mate value would provide a pathway linking social power to self-promotion. Findings from 218 participants (Mage = 38 years) revealed that experimentally manipulated social power enhanced perceived invulnerability, which in turn was positively associated with competitor derogation. Social power did not affect ratings of self-perceived mate value. Women more strongly endorsed self-promotion in pursuit of a short-term (vs. long-term) relationship, whereas men’s ratings did not vary by relationship goal. Our findings suggested that social power may influence goal-directed thinking and behavior in the context of romantic and sexual relationships.