In this paper, we analyze the psychometric characteristics of the Love Attitudes Scale: Short Form (LAS-SF), and the relationship between love style and other romantic relationships constructs in a Portuguese population. The LAS-SF measures six love styles: Eros, Ludus, Storge, Pragma, Mania and Agape, which are grounded on Lee’s theory. This tool is one of the most utilized assessments of love in the literature. There were 1153 Portuguese participants (554 women, mean age = 38 years). Confirmatory factor analyses evidenced that the six latent dimensions of the LAS-SF confirmed an acceptable fit to the data. The internal consistency of the Portuguese form of the LAS-SF was evaluated utilizing Cronbach’s Alpha (for subscales 0.71 to 0.78) and McDonald’s Omega (for subscales 0.71 to 0.79). Eros was positively related to satisfaction with love life, satisfaction with sex life, sexual desire, commitment, and negatively associated with romantic loneliness. Ludic orientation was positively correlated with romantic loneliness and negatively correlated with commitment. Storgic orientation was positively related to commitment. Pragma was positively related to romantic loneliness. Mania was positively related to commitment. Agape was positively correlated with satisfaction with love life and commitment, and negatively correlated with romantic loneliness. Notably, commitment mediated the relationship of the agapic love style and romantic loneliness.