Participants fill out a questionnaire on libido and their possible partner relationship on the website http://www.onderzoek-libido.be.~A blood sample is taken for sex steroid analysis. The relation will be investigated between testosterone, free testosterone, sex hormone binding globulin, estradiol, DHEA and androstenedione and scores on relational and sexual satisfaction and sexual desire.
Participants fill out a questionnaire on libido and their possible partner relationship.~A blood sample is taken for sex steroid analysis.