Popular stories currently unavailable Top videos Popular videos currently unavailable. And a new study shows that genetics may be a factor: Two-thirds of women who had their first baby between and worked during their pregnancyand 80 percent of those women worked within one month or less of giving birth. HPV, or human papillomavirus, comes in both low- and high-risk forms; low-risk HPV can cause genital warts, and high-risk can cause cervical and other cancers. In 90 percent of cases, the body's immune system will fight off the disease within two years. Check out these stats to see if you are well within the sexual mean — or if you're off the charts. More than half of those who had sex with a friend said they had engaged in all forms of sex;
Do you reach orgasm every time?
When is the normal age for girls to lose their virginity?
Sexual health on NBCNews. Check out these stats to see if you are well within the sexual mean — or if you're off the charts. The average male loses his virginity at age According to a survey of adults aged 20 to 59, women have an average of four sex partners during their lifetime; men have an average of seven. But she's outdone by the male record-holder for most kids, a Moroccan emperor who, according to the Guinness Book of World Records, sired "at least daughters and sons, and byhe was reputed to have male descendants.