Re: porn?
"[...] consenting 14 year olds [...]".
Pretty much anything with under-18s is likely to either be very self-censored for anything that could be tangentially regarded as sexual - or risk a prosecution. Even then - you can still be prosecuted for owning a legal film if the prosecution decides you were thinking unwholesome thoughts while watching it.
Imagine a young playwright with a synopsis for a prime TV slot of a couple of 14 year olds getting it together. Aided by an elderly woman who is supposed to be responsible for them - knowing that the parents would be livid. "Sorry Will - nice story but no way we'd get it past the censors. Have to cut the sex relationship - but we'll keep the sword fight killing".