Because there are a lot of young people who don't have access to information about sex from people in "real life". It could be that their parents avoid talking about it or they're ashamed to ask anyone they know... It's sad really because it's 100% natural and it should be a topic that can be discussed openly :)
I would like to know where you're getting your statistics from ... seems your math skills are in serious need of fine tuning.
Not recently, I don't think. In the past, this website's had its fair share of sex-related questions.
I wouldn't say 90% of them, maybe 30%, and even that number has declined in the past 3 months or so