Well, I can't speak for everyone in the U.S., but I can share my experiences and thoughts with you.
I think people explore their sexuality at a rate they feel comfortable with and that's a healthy way of going about it.
When I was 16 or so, sex and the opposite sex became a huge deal. I went to an all girl Catholic high school, so the suppressed teenage hormones really raneth over during school dances and other mixers. True, not everyone had sex, but we girls talked during lunch and on the phone about who was cute, who was dating whom, who was going with whom to the annual formal dance, etc. Oh, we did some studying too.
I went on to a large public university. Actually back in the day my school was featured on MTV as a party school, and honestly I was determined to have a full social (and academic) life. I had crushes and people I fooled around with, and it all culminated to losing my virginity to a bf at the age of 20. Actually I thought I was a late bloomer, but when I talked to my gfs, I found that half were virgins.
Lately I have realized that I haven't been spending enough time on developing the kind of relationships that I would like to have with men. Sure, I've been asked out, but I was always reluctant for some reason!
About Hollywood. Sure, it's oversexed, but that's part of its glamour, I suppose.
I'm 33 and I live in a state near yours!