Today, Kassandra discusses human sexual biology, mating systems, and what this all means in terms of our sexuality. Kassandra is a bio-social anthropologist who studies sexual evolutionary biology, social construction and sexual diversity. She is the research coordinator at the Center for Positive Sexuality, a sex-positive nonprofit that develops educational panels and cutting-edge research on kink, BDSM, sex education and a variety of other topics.

To speak with Kassandra, or learn more about her and her work, visit the Center for Positive Sexuality's website or connect with her via email.

Sex at Dawn by Christopher Ryan

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