This is an old Australian joke
. It might help to understand that a century ago, the methodist church was one of the parts of the temperance
priest comes home and sees his son reading the bible. "Daddy daddy", he asks, "I've been reading the bible but it's really hard. Why is contraception a sin?". His father replies: "Well now that you ask my son. Using contraception might lead to sex, and sex might lead to dancing."