Dang, original comment wasn't civil enough. Basic thoughts. It's funny you bring up the pleasure of sex as the Pill eliminates ovulation which is generally speaking the time of greatest sexual desire and fulfillment for women. 

Also, I'll give you a more palatable example of the intention question for moral action. White lies. They are often glossed over as morally acceptable because the intention is to save someone's feelings and make them happy. Doesn't change the reality of me looking stupid in a shirt with a stain on it after I ask my wife if it looks OK and she says "Yes, dear" just because she doesn't want to hurt me. Same exact logic in contraception and nuclear war. 

Finally, you obviously have a much different outlook on happiness, human nature, the body, and sex. Fine. Just don't mistake it for Catholicism. It's in complete discontinuity with the entirety of Catholic history and the Scriptures.