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Both [[women]] and [[men]] have [[hormone|hormonal cycles]] which determine both when a woman can achieve [[pregnancy]] and when a man is most fertile. The average female cycle is twenty-eight days long, but the male cycle is variable. Women ovulate at about the fourteenth day of their cycle (though this varies), with the days leading up to ovulation being the woman's most fertile period. A woman can determine when she is most fertile by using a basal thermometer and charting cervical mucus characteristics. Women tend to dress more provocatively during ovulation to attract a mate.<ref>[http://www.bbc.co.uk/news/health-10878750 ''Ovulation hormones make women 'choose clingy clothes''', BBC News]</ref>
Both [[women]] and [[men]] have [[hormone|hormonal cycles]] which determine both when a woman can achieve [[pregnancy]] and when a man is most fertile. The average female cycle is twenty-eight days long, but the male cycle is variable. Women ovulate at about the fourteenth day of their cycle (though this varies), with the days leading up to ovulation being the woman's most fertile period. A woman can determine when she is most fertile by using a basal thermometer and charting cervical mucus characteristics. Women tend to dress more provocatively during ovulation to attract a mate.<ref>[https://www.bbc.co.uk/news/health-10878750 ''Ovulation hormones make women 'choose clingy clothes''', BBC News]</ref>
Men can ejaculate and produce sperm at any time of the month, but their libido dips occasionally, which scientists guess is in relation to their internal cycle. Male testosterone levels surge when he detects odors of an ovulating woman, leading to an increased sex drive.<ref>[http://www.scienceagogo.com/news/20100013214756data_trunc_sys.shtml ''Male testosterone levels surge with ovulation'', ScienceAGogo]</ref>
Men can ejaculate and produce sperm at any time of the month, but their libido dips occasionally, which scientists guess is in relation to their internal cycle. Male testosterone levels surge when he detects odors of an ovulating woman, leading to an increased sex drive.<ref>[http://www.scienceagogo.com/news/20100013214756data_trunc_sys.shtml ''Male testosterone levels surge with ovulation'', ScienceAGogo]</ref>