Sex is certainly one of the most sensation in life (pardon me
but do hear me out) but anything before marriage no matter if it is
bf-gf courtship, one night stand, extra marital affairs and for
some, they called it deep sense of mutual love, it is simply
lust.
However, sex in a marriage is the most blessed and wonderful act of
love between the husband and wife which will certainly help in
fostering their relationship instead.
Any premarital sex will only lead to more problems down the road
and have repercussion effects in later age.