Think my friends....Its true that lust(raga)is what that will make person lag behind nirvana.Bt provided that all people get there mind free from raga'will make an earth without human beings.Can you think of reproduction of human without raga?
What I feel is raga make people(a couple) together.A couple make a child.Its true that Birth is the start of suffering.Bt think about makind....From which point this issue should clarified.
No, it seems you have misunderstand it. My simple answer to your complication as follows;
According to the Buddhist Philosophy average general people observe five precects. But people who observe sil on poya days, should follow 8 or 10 precects, who supoose to have more restriction rather. This will more complicate and complex to monks as they observe more precects than above 2 cases.
If anybody follows the five precects correctly and who lives acccordingly, he/she can avoid sin. Those who can live naturaliy as accrding to ethics of the world. if you breach any of precects you will resulted with sin(s) accordingly.
Further he/she can't attain nibbana simply doing that, which needs much more dedication and commitments to practise.
I hope this will help to clear your doubts now.
Treple Gem Bless to You.