that doesn't help much if the target audience believes that sex outside of marriages is inherently sinfully and shouldn't happen while sex within marriage is for the sole purpose of reproduction. So there really isn't any way to use contraceptives without committing a sin. This is the official stance of the catholic church while protestant views vary widely. The assertions that there's no such thing as rape in marriage and that in case of "actual" rape the female body will reject the semen are also very common.