Howcute posters say channel warned

They claim they the nudity is a by-product, the programs are drama or enertainment, and the plot just happens to require shagging. It's exactly the same justification used by Channel 5 for a Girls Guide To 21st Century Sex (education), Channel 4, or the BBC (Rome, Naked Practice sketches on old series of Armstrong & Miller and Alexander, Monty Python, etc). Or no end of "arty" films passed by the BBFC (Brown Bunny, 9 Songs, Lovers Guide ...).

Explicit sex is OK as long as it is not enjoyable.