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On first glance, sticking with one partner for life seems like quite a bad idea, at least from an evolutionary point of view. Sperm is plentiful and does not take long to make, so it would not benefit a male to invest in only one female, who will take a long time to reproduce.
 sex disease STI infidelity
The rate of illegitimate births in the British population is much lower than many people believe, a study says. It suggests an oft-quoted figure of one in 10 for the number of children fathered illegitimately is a myth. The real number is more likely to be less than one in 25, researchers say.

2009-02-11

 genealogy genetics illegitimate adoption infidelity family tree surname ancestor
Some people may be genetically programmed to be unfaithful to their partner, a scientist has claimed. ... Focusing on women, he found that if one of a pair of twins had a history of infidelity, the chances her sister would also stray were about 55%. In general it is estimated that just 23% of women are not faithful.

2004-06-07

 sex evolution attraction genetics love infidelity women fidelity
Infidelity may be natural according to studies that show nine out of 10 mamals and birds that mate for life are unfaithful. Experts found animals that fool around are only following the urges of biology. New studies using genetic testing techniques show that even the most apparently devoted of partners often go in search of the sexual company of strangers. Females stray to gather the best possible genes for their offspring, while males are...

1998-09-25

 sex evolution attraction love infidelity fidelity monogamy