You also need to ask about the following:
The difficulties premarital sex can cause.
The guilt people carry because the instinct knew it was wrong.
The condoms that failed to solve the problems of premarital sex. etc...
.
Find a soul mate and commit to the natural way of loyalty and trust between you and your mate for life. Then just honor your contract.
If you ask me, Qoran aside, when you are learning about life do not learn premarital sex or post marital sex and life will have less problems for you.
But your choice.
GOD bless.
Peace.