Differences in digit ratios between gay men who prefer receptive versus insertive sex roles indicate a role for prenatal androgen | Scientific Reports
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Everything You Wanted To Know About Tops And Bottoms | HuffPost Life
Tops, Bottoms, and PrEP: What You Need to Know about HIV Prevention - PrEP Daily
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Beyond Tops and Bottoms: Correlations between Sex-Role Preferences and Physical Preferences for Partners among Gay Men
What Does It Mean to Be a Top, Bottom, or Vers: Sexual Preferences and Queer Sex | Them