The institutional Church has a terrible understanding of sex. The rules amount to "thou shalt not", unless you are a married couple, and then you have to pretend you are doing it to procreate. The rules and teachings are given by the celibate, who simply have no experience (or are at least supposed to have none) of sex. The understanding of sex owes more to the Roman Stoics and Gnostics than anything else -- sex has to be "justified, it is not good in and of itself.

John Paul the Overhyped showed that his understanding of women and the family was crap. He actually wasn't all that good as a theologian. Theology of the Body shows a fundamental lack of understanding about sex in marriage.