This is a topic which confuses most of the young people today. May be you think that love is directly related to sex. May be you have misunderstand that the relationship between sweethearts can be maintained only when there is sex. There are many other important requirements to   maintain love in a relationship. Love should not be used as an excuse to have sex. According to Myanmar culture and social norms, most people do not accept premarital sex. Premarital sex can result in negative consequences (such as early pregnancy, infections, etc.). Sense of responsibility along with love can help love to last long.