Psychometric Properties of the Attitudes Toward Polyamory Scale (ATP) in the Spanish Context

Given the potential discrimination faced by individuals in polyamorous relationships, understanding attitudes toward polyamory in society is crucial. To this end, instruments to measure attitudes toward polyamory with adequate psychometric properties are necessary. The aim of this study was to adapt the Attitudes Toward Polyamory Scale (ATP) to the Spanish context and analyze its psychometric properties in a sample of young adults. The sample comprised 1,162 individuals aged 18 to 35 years. Participants responded to sociodemographic questions and completed the Revised Sexual Opinion Survey (SOS) and the ATP. The findings indicate: (1) adequate reliability coefficients, (2) good fit statistics for the one-factor confirmatory model that verify results of exploratory factor analysis, (3) that homosexual and bisexual people have more favorable attitudes toward polyamory than heterosexual, (4) positive correlations between ATP scores, SOS scores, and political orientation (individuals with higher levels of erotophilia and a more left-leaning political orientation tend to hold more favorable attitudes toward polyamory), and (5) association between ATP scores and religion, with non-religious individuals showing more favorable attitudes toward polyamory than Catholics. In conclusion, the ATP demonstrates adequate psychometric properties in Spanish young adults.