[quote=Tom of Assisi]for when my friend asks: can you give me an exact and concise definition of contraception?
Contraception is any action before, during, or after the marital act (ie, intercourse) that frustrates (ie, attempts to render sterile) the natural consequence of the intercourse.
NFP is not contraceptive because there is no intercourse. It’s not a sterile act, because it’s not an act at all.
Abstaining is not the same thing as contracepting. The Church does not require couples to have sex with any specific frequency (or at all once the marriage is consummated). What it does require is that IF one engages in intercourse one takes no action before, during, or after that falsifies the act.
So, I can NOT have sex at all, and I do nothing wrong. If I HAVE sex, I must respect the act, its meaning, and its end.
NFP is an alternative to abstinence, not an alternative to contraception. It merely observes a woman’s natural signs and minimizes the days of abstinence.