Background: Sexual fantasies are described as thoughts or mental images with sexual content. The Hurlbert Index of Sexual Fantasy (HISF) evaluates the positive attitude towards sexual fantasies. The objective of this study was to provide validity evidence of the Spanish version of the HISF and to present its standard scores.
Method: The sample was composed of 3,458 adults from the general Spanish population (1,641 men; 1,817 women), distributed across age groups (18-34, 35-49, and over 50 years old).
Results: The unifactorial structure of the Spanish version of the HISF showed strict measurement invariance across sex, age range, and education level. Positive attitudes towards sexual fantasies significantly correlated with erotophilia, sexual assertiveness, sexual desire, and sexual functioning. Also, the scale was useful for differentiating between individuals with sexual functioning difficulties and individuals with no difficulties. Finally, the standard scores were obtained based on sex and age range.
Conclusions: The Spanish version of the HISF is a reliable, valid, and invariant scale for assessing a positive attitude towards sexual fantasies in people with different sociodemographic characteristics.