The study design was a cross-sectional online survey implemented in the survey software Typeform v2 ( The study was online from . Subjects were told that the survey was about the qualities of their ideal partner(s). Participants younger than 18 were not able to participate in the survey. All participants completed a 14-item section focusing on demographic information and long-term preferences. In a third part, participants could answer questions about potential short-term partners, if they were willing to do so. Ten parallel language versions of the survey were developed: Chinese, Danish, English, French, German, Italian, Footnote 3 Japanese, Portuguese, Russian, and Spanish. Continue reading “In a second step, they could answer an optional 30-item part (concerning past relationships and preferences for physical features)”