Bit of An Inappropriate Question - Is it Common for Highschooler to hv S3x or Is That Just a Thing In the Movies?

I was curious because I plan to study in the US and just wanted to be aware of the kind of dating culture that I might experience there. Having s3x at that age is super uncommon in most countries and many often wait till marriage or loose their v-card at around 20-24 years old.