People who don't have sex develop mental and physical problems.

More importantly, abstinence programs have been shown to increase the sexually transmitted disease rate and pregnancy rate in people under 18. Ignorance is not bliss.

and all over the world first age of sex varies from not much younger than the us to not much older than the us.

http://chartsbin.com/view/xxj

Some people do not enjoy sex or want to "save" it. That's cool. But some people are hot sex monkeys and are going to start at the youngest possible age and get diseases and spit out babies unless properly taught.

So I guess I agree with your point- people are different. All of them. In every culture. So you need to give them information to protect themselves and then leave them to their natures.