Study shows how menstrual cycle affects consumer behavior

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Through analysis of daily responses to survey items such as to what degree the respondent wore clothes that attracted sexual attention, spent time making herself beautiful, sun bathed, and ate highly caloric foods, a distinct pattern emerged. There was a marked increase in women's appearance-related behaviours during the fertile phase of the menstrual cycle (roughly days eight to 15 of a 28-day cycle). Women were also more likely to spend more money on clothes during the fertile phase.

http://phys.org/news/2012-07-menstrual-affects-consumer-behavior.html