More women lost their virginity under the age of And a new study shows that genetics may be a factor: No matter what those, ahem, movies might suggest, in the United States, the average erect penis is five to seven inches long, and four to six inches in circumference. Many factors can influence how often people have sex. If they are busy with work or childcare, they might not have as much time for sex as they used to. While a quarter of men claim to have had 10 sexual partners, a quarter of women claim to have had only one. This was the highest rate in this age category. National Sleep Foundation Do you reach orgasm every time? What is the average number of sexual partners in the UK? Do men or women have more sexual partners? 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 there's also an argument for men's biological drive to perpetuate their genes: Getty Images Stock At least 50 percent of sexually active men and women will have a genital HPV infection at some point in their lives. It may take time to figure this out, but putting the focus on intimacy, communication, and bonding with a partner is more important than worrying about numbers, targets, or the sexual frequency of other couples. Researchers from Carnegie Mellon University conducted a study of 64 couples between the ages of 35 and Remember that every couple is different. Almost a third of women had sex for the first time when they were legally under age.