What is the purpose of sexual intimacy?

Sexual intimacy was created for procreation and pleasure of the couple. And each one must seek the satisfaction of the other.

1Co 7:3-4

TLet the husband render to his wife the affection due her, and likewise also the wife to her husband. The wife does not have authority over her own body, but the husband does. And likewise the husband does not have authority over his own body, but the wife does.