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Chapter 356MethodsParticipantsEighty participants were recruited through online advertisement and flyering at the university buildings for a scientific speed-dating event in Leiden, The Netherlands. Seventy (N = 70) attended the experimental session (35 women, Mage= 22.03, SD = 2.14; men: Mage = 22.49, SD = 1.97). Twenty-two women used hormonal contraceptives. In line with the inclusion criteria, all participants reported that they were between 18 and 26 years old, heterosexual, single, Dutch-speaking, and not under treatment for psychiatric disorders. Furthermore, all participants reported normal or corrected-to-normal vision and normal color vision, as well as normal hearing acuity. Three participants (1 woman) dropped out before the speed-dating part of the study; resulting in a final sample of 67 participants and 277 speed-dates. All participants provided informed consent as according to the declaration of Helsinki. Participants were not compensated for their participation, but received a ticket to Apenheul Primate Park (Apeldoorn, the Netherlands) to thank them for their participation. The procedure and methods were approved by the Leiden University Ethics Committee (CEP: 2020-02-20-M.E. Kret-V1–2169).ProcedureThe experiment (pre-registered using the AsPredicted database, reference number: #36394) took place on the 28th of February and 1st of March 2020 in Leiden, The Netherlands. In the 4 weeks before the experiment, participants signed up via an online Qualtrics form (Qualtrics, Provo, UT), where they selected a specific time to participate in the experiment (i.e. selected their group). Each group consisted of a maximum of 10 men and 10 women. Participants were instructed that prior to their arrival they avoid wearing heavy make-up, strongsmelling products (e.g., perfume and deodorant), and provocative clothing.Upon arrival to the experimental session, men and women were seated in different rooms and were asked to provide informed consent, and fill in questionnaires regarding background information (e.g., education, use of dating apps) and trait sexual desire (Elaut et al., 2010; Spector et al., 1996). After participants completed the questionnaires, a researcher took a standardized portrait picture separately for each participant using a Canon EOS 40D camera set at portrait mode, with a EF 28-135 mm f/3.5–5.6 IS USM lens. The photographer was located 1 m from the participant, and zoomed in so that a slight empty space was present around the face of the participant. For this picture, participants were Tom Roth.indd 56 16-01-2024 08:15