The Flirtation (1904), by Eugene de Blaas
Female baboons and many other primates experience sexual swellings that advertise their fertility during estrus. Humans do not display any such obvious physical signals of fertility, but may still experience a subtle estrus-like state.

In evolutionary terms, the ovulatory shift hypothesis posits that female humans exhibit different sexual behaviours and desires at points in their menstrual cycle, as a means to ensure that they attract a high quality mate to copulate with during their most fertile time.

- Sexual attraction

The ovulatory shift hypothesis proposes that women at high fertility should be most attracted to short-term sexual partners with physical and behavioral features that likely signal genetic fitness, or good genes.

- Ovulatory shift hypothesis
The Flirtation (1904), by Eugene de Blaas

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