The start of ovulation can be detected by various signs. Because the signs are not readily discernible by people other than the woman herself, humans are said to have a concealed ovulation.
Women near ovulation experience changes in the cervix, in mucus produced by the cervix, and in their basal body temperature. Furthermore, many women also experience secondary fertility signs including Mittelschmerz (pain associated with ovulation) and a heightened sense of smell.
Many women experience heightened sexual desire in the several days immediately before ovulation. One study concluded that women subtly improve their facial attractiveness during ovulation and period.
On June 11 2008 the New Scientist published an article about Belgian Professor Jaques Donnez, who successfully made photographs at the exact moment of ovulation. Until now this was considered very difficult to achieve.
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