(crossposted from simplyexplained.com)
Does the Catholic religion of today allow the use of birth control pills, or any other means of birth prevention? (Other than the rhythm method).
The Catechism of the Catholic Church deals with this topic under the section which interprets the sixth commandment (“You shall not commit adultery.”). It quotes from Pope Paul VI’s encyclical Humanae Vitae, which states that “each and every marriage act must remain open to the transmission of life”. Paul VI emphasizes that this has been constant doctrine.
The CCC further quotes from HV, stating that “every action which, either in anticipation of the conjugal act, or in its accomplishment, or in the development of its natural consequences, propose, whether as an end or as a means, to render procreation impossible is intrinsically evil” (CCC 2370).
As such, ALL physical contraceptive devices, substances and pharmaceuticals are prohibited from use by Catholics, employment of which constitutes serious sin.
The CCC (again drawing from HV) also describes a valid means of spacing births: “Periodic continence, that is, the methods of birth regulation based on self-observation and the use of infertile periods, is in conformity with the objective criteria of morality.” (CCC 2370)
A few secondary points regarding the question deserve some attention:
One system or method considered valid by the Catholic Church is “Natural Family Planning”, or NFP (see Wikipedia and the web). Some consider the rhythm method to fall under the umbrella of NFP, and most clarify that the terms RM and NFP do not refer to precisely the same thing, and ought not be used interchangeably.
There is no contrasting “Catholic religion of today”. The Catholic Church today is the selfsame Catholic Church of a century ago, of a millennium ago, of 2 millenia ago. It was, and is still, the singular and sole church founded by Jesus Christ himself.