The Catholic Church does not want married couplesto have sex just for pleasure.
The Catholic Church wants married couples to have the best sex possible!
Sexual pleasure in marriage is good. Pleasure is a part of intercourse, however, not its sole focus. There is, after all, a difference between simply "having sex," which includes actions aimed at one's own pleasure, and "making love," which involves giving oneself to another. Put another way, there is a difference between "self-taking" and "self-giving."
"Making love" as God planned it for marriage, means that husband and wife offer themselves to each other as a gift. This sexual gift is faithful and exclusive. It rejoices in the other person, is respectful of God's design, and welcomes a child who may come from their union. It thus has the potential to build the family. In expressing the mutual love and commitments of husband and wife, sexual intercourse becomes a lasting source of joy in their marital relationship.