Less than half of US teenagers between 15 and 19 have had sex, according to a survey that covers the past 25 years.
More than four in 10 never-married women in that age group have had intercourse once, down from nearly three in five in a 1988 poll.
Reuters is also reporting that sexual activity among male teens fell to 47 percent from 69 percent in the same period.
The survey by the National Center for Health Statistics polled 1,037 female and 1,088 male US teens from 2011 to 2013.
It shows that boys are more likely to become sexually active in their early years than girls.
By late teens, the percentage of teenagers who had sexual intercourse is similar for both genders.
The study found teenagers use most forms of contraceptives at similar rates as they did over the past decade.
Condoms are still the most common form of contraception for them.
While the number of teens using the birth control pill and withdrawal contraceptive methods during their first sexual experiences remained the same, the use of so-called morning-after pill rose to 22 percent from 8 percent.
The study also looked at teenage pregnancy rates tied to contraceptive use.
In 2013, the US birth rate for 15 to 19-year-olds dropped by more than half since its peak in 1991 but the rate was still higher than in other developed countries.
Girls who did not use some form of contraception the first time they had sex were twice as likely to become a mother in their teenage years as those who used a method.
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