Come on guys, make love, not war

Why sex before marriage happens nowadays? I got explanation from FM radio earlier.

Every teenagers have desires on opposite sex or should we say "sex drive"

Last time... which is our grandfather time, people often got early marriage, that is before 20 already married. So their "sex drive" could be fulfiled...

For now, we seldom see people get marry before age 20 while "sex drive" still exists in every teenagers.

Hope you guys understand what i trying to tell here, I'm not good in explaining