Not only a sin its also illegal

No puberty(usually)=no marriage=no sex or its a sin. Simple as that

If the person hv sex before marriage it's sin and what's ur definition of akeme adam coz according to the law a person can get married at 18 but can't drink alcohol till 21 which is stupid which decision needs maturity? So it all depends on u.

Is a sin either way if you are not married

Sayageba sex yaderege hulu atyategna new