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Frequency of sexual intercourse in permanent couples Sergio Rinaldi

Frequency of sexual intercourse in permanent couples Sergio Rinaldi DEI, Politecnico di Milano, Milano, Italy EEP, IIASA, Laxenburg, Austria. Summary. The first model in sexology. A model is simply a set of conjectures (axioms).

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Frequency of sexual intercourse in permanent couples Sergio Rinaldi

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  1. Frequency of sexual intercourse in permanent couples Sergio Rinaldi DEI, Politecnico di Milano, Milano, Italy EEP, IIASA, Laxenburg, Austria

  2. Summary • The first model in sexology • A model is simply a set of conjectures (axioms) • A new model can be identical to an already existing model (conceived in another field) • A model can have infinite attractors and repellers • A model can have no bifurcations (universal model)

  3. Empirical studies • There are rich data sets (see references) From statistical analyses of data it is possible to conclude frequency of intercourses 0 time Tmax

  4. An old folk theory • Martin’s law (Journal of Sex Research, 1970) first year of marriage after first year of marriage At the end of your life there are still beans in the box

  5. An old folk theory • Martin’s law (Journal of Sex Research, 1970) first year of marriage after first year of marriage frequency of intercourse 0 time Tmax

  6. A conceptual model : erotic potential at time : sexual appetite at time : frequency of sexual intercourse First axiom Second axiom Third axiom ODE model

  7. A conceptual model : erotic potential at time : frequency of sexual intercourse The proposed ODE model is identical to the first epidemic model proposed in 1925 (Kermack and McKendrick) infinite attractors and repellers

  8. Adimensionalization rescaling

  9. The map x0 → x∞ numerically

  10. Total sexual activity frequency of intercourse 0 time

  11. Martin’s law Conclusion: Martin’s law is wrong (but our model overestimates NII ...)

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