Testing sex differences in the relationship context needs the inclusion of gay and lesbian couples.

The target article suggests that romantic relationships matter more to men than women. I discuss the work of West, Popp, and Kenny (2008), suggesting that properly testing for hypothesized sex differences requires gay and lesbian couples to serve as reference groups. A modified actor-partner interdependence model (APIM) can then test if relationships matter more to men in relationships (i.e., straight and gay) or matter more to people in relationships with women (i.e., straight men or lesbians).