It made sense in 1933

Found this little (amended) snippet that’s still on the statute:

If any person having responsibility for a child or young person who has attained the age of four years and is under the age of sixteen years, allows that child or young person to reside in or to frequent a brothel, he shall be liable on summary conviction to a fine not exceeding level 2 on the standard scale, or alternatively or in addition thereto, to imprisonment for any term not exceeding six months.

Children and Young Persons Act 1933, §3(1)

Fortunately, those of you who allow your three year olds to frequent brothels have nothing to worry about.

http://www.statutelaw.gov.uk/content.aspx?activeTextDocId=1109288