Women menstruate once a month for five days, on average. Menstrual cycles affect
each woman differently, and can cause mood changes, hormone fluctuations, physical
pain, lethargy, nausea, increased appetite, and heightened emotional sensitivity.
While some women experience little to no pain at all, others become close to
bed-ridden during this time of the month. Don’t underestimate the physical strain of
a menstrual cycle.
Women are more likely to lose interest in sex due to emotional factors than men are.
These may include problems in the relationship, coping with loss or death, and so
on.

Consider making the first move. Yes, it’s the 21st century, but in general, men are
still expected to approach women first. Of course, some women are more bold and
proactive than others, so she might surprise you by asking you out first.

It gets more interesting. Read More - http://rhodiesworld.com/rw-exclusive-understanding-the-nature-of-a-woman/