Background and aims: Despite the inclusion of Compulsive Sexual Behavior (CSB) as a diagnostic entity in the ICD-11 and the increasing number of studies addressing psychological factors leading to its onset and maintenance, little is known about the role of hormonal factors when accounting for this clinical condition (especially in women). This study aimed to provide insights into the association between testosterone levels (i.e., the androgen more intimately linked to sexual desire and arousability) and CSB in both men and women. Methods: A total of 80 participants (40 men [Mage 5 22.31; SD 5 2.93] and 40 women [Mage 5 21.79; SD 5 2.06]) provided a saliva sample for the estimation of the level of free testosterone and completed a battery of measures assessing CSB and other related sexual domains (sexual sensation seeking and online/offline sexual behavior). Results: In men, salivary testosterone had a positive and significant correlation with three scales assessing CSB (r between 0.316 and 0.334). In women, these correlations were small and non-significant (r between 0.011 and 0.079). In both men and women, the level of salivary testosterone had small non-significant correlations with the other domains of sexual behavior assessed. Discussion and conclusions: Individuals? level of testosterone may contribute to the etiopathogenesis of CSB, but only in men. In women, alternative psychological -i.e., motivational, behavioral, or cognitive- processes may be playing a more central role in the expression of this condition.  Kulcsszavak: Compulsive Sexual Behavior, sex hormones, testosterone, biological sex