[troutman]

IIRC, some estimates have it that 10% of fathers are unknowingly not the biological father.

http://forum.calgarypuck.com/showthr...logical+father

http://forum.calgarypuck.com/showthr...ight=paternity


http://www.cambridge.org/catalogue/c...1239571&ss=exc

Female infidelity is common in the animal kingdom as well as among humans. According to an analysis of 280 000 paternity tests conducted in 1999 by the American Association of Blood Banks, approximately 30% of children are fathered by extra-pair copulations; that is, 30% of children in this sample were fathered by someone other than the woman’s long-term romantic partner.

Because of concealed ovulation, internal fertilization, and female infidelity, human parental certainty is asymmetrical: unlike females, who are always 100% certain of maternity, males can never be certain of paternity. Current estimates of extra-pair paternity (paternity by someone other than the putative and domestic father, or ####oldry) are between 1 and 30%, with the best estimate at about 10%