15 sex partners common in US

A new US government survey found that 29 percent of American men and nine percent of women reported they've had sex with at least 15 partners in their lifetime.

The average number of sexual partners was 6.8 for men and 3.7 for women, said the Centres for Disease Control and Prevention survey.

It included 6 237 people, ages 20 to 59, who were asked about their sexual habits and drug use.