RAF mate of mine did a rewrite in Singapore round about the time Lee Kwan Yu had a clamp down on drug orientated music. BBC World Service had to change the sig tune of their Folk Music programme(It WAS Walk Right In) and poor old Puff was on the banned list. This is Dave Kendricks sex and violence version.

Puff the magic dragon didn't have a mate
Used to walk the streets at night, sometimes very late
Then one day he met her, she was bloody rough
He didn't know quite what to do that's why they called him puff

Dragons aren’t so common, magic ones are rare
And quite soon of offspring Puff's mistress did despair
But she was very cunning so everything she tried
Including Swedish picture books so's he would have a guide

Puff's not slow at learning what he does not know
And pretty soon with some success the dragon had a go
Then to that magic dragon came manhood with a rush
So now you know why little Jackie Paper got the push.

Circa 1970 if I remember right.