Genes blamed for early first sex

The researchers at the University of Oregon compared the average age of first intercourse among children whose fathers were always absent, partially absent or always present throughout childhood.

They looked at more than 1,000 cousins aged 14 and older from the American National Longitudinal Survey of Youth.

For the children whose fathers were always absent, 63.2% reported having had sex.

This compared to 52.5% of children whose fathers were sometimes absent.

And only 21% of children whose fathers were always present.

The average age of first intercourse for children whose fathers were always absent was 15.28, compared to partially fathered children at 15.36 and 16.11 for children whose fathers were present for all of their childhood.

It compared children who were related in different ways to each other, and who differed in whether they had lived with their fathers.

The more genes the children shared, the more similar their ages of first intercourse, regardless of whether or not the children had an absent father.