Why men are most active sexually from late 20s

If you think men can simply ignore their biological clock, think again as a new study shows that their fertility is just as susceptible to the effects of time as that of women.

A French study of over 12,200 couples having fertility treatment suggests the chance of a successful pregnancy falls when the man is aged over 35.

The quality of sperm begins to deteriorate in the mid-thirties and by the time a man is 45, one in three pregnancies end in miscarriage regardless of the age of the mother, the study says.

The researchers studied couples who had sought treatment for infertility at the Eylau Centre for Assisted Reproduction in Paris between January 2002 and December 2006.

All were given intrauterine inseminations (IUI), also known as artificial insemination, where sperm is inserted into the womb when the woman is ovulating.

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