Think they're all doing it? Maybe not so much - just 43 percent of teens said they'd had sex.

Girlfriends, boyfriends - one-night stands? Who are teens having sex with these days? Almost 70 percent of girls and 56 percent of boys said they were "going steady" with their sexual partners. The rest were people they had just met or went out with once in a while, or were living with or were engaged to.

When asked how many sexual partners they'd had in the past month, almost 60 percent of teens said they hadn't had sex. Meanwhile, roughly 4 percent of girls and 4.5 percent of boys had had four or more partners.

Are prom movies telling the truth about how much teens want to lose their virginity?

Maybe - about 41 percent of girls and 63 percent of boys said they really wanted to have sex at the time. But just under 11 percent of girls and 5 percent of boys said they wish they'd waited.

Teens aren't lax about safe sex. Of sexually active teens, almost 86 percent of girls and 93 percent of boys use birth control. Condoms are especially popular, used by 52 percent of girls and almost 75 percent of boys who'd had sex in the last three months. That's up from 2002, when 71 percent of boys said they used a condom during their first time having sex. Back in 1988, only 55 percent of boys did.

As far as other methods go - roughly 30 percent used the pill, and the rest used hormonal or other methods.

Is a positive pregnancy test positive news for teens? Not quite. Almost 58 percent of girls and 51 percent of boys said they'd be "very upset" to receive the news, and less than 5 percent of girls and 4 percent of boys said they'd be "very pleased."