Why not teach our children, both male and female, that sex is exclusively between a man and woman, is restricted to those who are married, and should be open to the possibility of life? 

Paul VI in Humanae Vitae noted that the widespread use of contraception would "lead to conjugal infidelity and the general lowering of morality." He argued that contraception would result in men losing respect for woman and result in them "considering her as a mere instrument of selfish enjoyment and no longer as his respected and beloved companion," and that  we would treat each other as objects of pleasure.

He was right.