The Church has tried to control women's bodies because women by nature have certain types of power men don't, including (usually) sexual power, reproductive power, and, in most modern societies, domestic power (over the home and children).  Most women become aware of these powers as teens and come to terms with them, deciding to what extent they will shape their relationships. 
Men have attempted to control women's sexuality by defining marital sex as the norm and making a husband's desire for sex a "right" that cannot be denied under normal circumstances. Analogously, they have also defined a "right" of the fetus that often competes with the woman's rights, and have done their best to subjugate one to the other. 
The Church has traditionally been an ally in the quest to neutralize women's powers and keep them dependent on men, even when men had to come to women for intercourse and offspring. Now they're trying to control gays, but the same rules don't apply, and it drives them nuts.