They aren’t reading their bibles if they think that’s a naughty word:
Matthew 15:19 -
"For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies …"
Matthew 19:9 -
"And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery."
1 Corinthians 7:2 -
"But because of the temptation to sexual immorality, each man should have his own wife and each woman her own husband."
Ephesians 5:3 -
"But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints"