The hormone changes during a woman's menstrual cycle can actually influence creativity, according to research. Also, it affects both women and men around them.

The research conducted tests on 34 healthy women aged 21-31 years old. Half of the women were a control group taking oral contraceptives, which regulate sex hormones. According to the study:
During the preovulatory phase, creativity was in general improved when serum concentrations of estrogen (E2) and luteinizing hormone (LH) were highest whereas motor perseveration decreased. In control women, there was no preovulatory improvement of divergent thinking and no preovulatory decrease in motor perseveration.
And in another study (PDF) of 28 women and 10 men (18-25 years old), researchers found similar results with figural creativity.

They were significantly higher in women during the preovulatory phase and luteal phases (post ovulation). Women who neared their peak fertility also seem to prefer men who displayed more creativity rather than wealth. CNN writes:
A new study suggests that when young men interact with a woman who is in the fertile period of her menstrual cycle, they pick up on subtle changes in her skin tone, voice, and scent - usually subconsciously - and respond by changing their speech patterns.

Specifically, they become less likely to mimic the woman's sentence structure. According to the researchers, this unintentional shift in language may serve to telegraph the man's creativity and nonconformity - qualities that are believed to attract potential mates.