Love is the main thing. Marriage is just only a celebration where it presents a certificate after a big party. So it's better to find a fiance who's wanna become ur true love Before u get married.
Second thig is dat, many ppl get divorced after few years of their marriage. But If u date someone then u feel he/she isn't match for u. U can break-up and don't need to divorced after marriage.
However, I think that sexual events must not be done before marriage for some reasons. Sometimes it may be problematic. But love won't be so.