Ovulatory cycle effects on tip earnings by lap dancers: economic evidence for human estrus?^☆

Effects of ovulatory cycle (Days 1–28) on average tip earnings per shift, for normally cycling women versus women using hormonal contraception (pill users); each data point represents a 3-day average of the indicated day, the previous day, and the following day.

Effects of ovulatory cycle phase (menstrual phase, fertile estrous phase, or luteal phase) on tip earnings per shift, for normally cycling women versus women using hormonal contraception (pill users). Error bars represent 95% confidence intervals.