Sex can become meaningful....

When young people delay physical involvement until its proper time, they allow the relationship to grow and mature. Then, once that relationship has developed into a lifelong marriage commitment, sex can become meaningful, constructive, and beneficial to the relationship. Until that commitment is sealed, however, the couple need to spend time
discovering each other, finding out what it is that makes the other unique and attractive. This forms the friendship that lays the foundation for love, which leads to the personal intimacy each seeks.
It is a building process, and cutting it short by getting into sex before marriage may make it impossible to put the process back on course.

Josh McDowell.