It is based on reality (Realism) that today's youth were engaging in premarital sex (sexual intercourse out of marriage). 
Some questions that surface with regards to sex education is this- Does sex education in school encourage a teenager to have sex? Well, it may or it may not. It depends largely on the upbringing and environment of the student. 

 

If basic knowledge about the topic is being taught at home by parents, there's a small chance that teens would be encouraged to engage in early sex because they're aware of its consequences. Since they were already familiar with the different sexual terms at home, the moment they hear it outside their place or in school, it'll be an ordinary thing and does not awaken any curiosity within them.