[metmom]

Abstinence is not contraception, which means altering the act of intercourse (by some action before, during or after) so as to sabotage its natural fertility.

Which condemns NFP.

Abstinence is to contraception as silence is to lying.

And people can lie with their silence. Like when they should speak up about the truth and remain silent to that everyone else thinks they agree.

[Mrs. Don-o]

Contraception is choosing to alter a sexual act to render it unnaturally infertile. No sexual act, no contraception.

For instance, Birth control pills can help irregular periods, PCOS, endometriosis, acne, menstrual cramps, and low estrogen conditions. But if there's no intercourse, it's not an act of contraception.

(NFP is not a sexual act at all, and therefore not an act of contraception.)