We make the sum greater than the addition of the parts. Sex without love is mating with just the genital organs, a kind of cooperative masturbation between two people. Sex with love is mating with the soul. And out of this springs the family, the highest expression of loving and commitment. Just ask Noah.
Sex is an important part of the relationship between two people.
In Genesis, the first man is really being described as a hermaphrodite creature, torn apart to result in man and woman. In fact, many experts on word origins feel that the word sex is derived from the Latin, seco, secare, to cut or cut apart. Philo, a Jewish philosopher contemporaneous with Jesus, said that Adam was a double hermaphrodite being in the likeness of God. The longing for reunion pervades our sexual beings on all levels, humans more than other animals as we long to mate with our souls, not just our genitals. This is why we have an institution called marriage.