I wish I can take credit for finding this, but the credit goes to a fellow fan/collector who wishes to remain anonymous for the sake of his peaceful household. I don't know if this info was already out there among fans, but this is the first time I've heard this.
Perhaps unbenounced (or not) to ELO or their management, several ELO songs were used in an adult video from 1976 called Ecstasy In Blue. As is the case with many films of its genre, Ecstasy In Blue is this hilariously bad account of some scary-looking freaky guy who has magic powers over women, or something like that. The plot kind of escaped me. And according to the description on the box, the cinematography is great. I, er, beg to differ.
The video apparently made its way to DVD a few years ago. I'm told it wasn't terribly uncommon in those days for adult movie directors to use music by popular artists. But what makes this juicy bit of info even more odd is the ELO songs (among others) they decided to use:
Fire On High
In The Hall Of The Mountain King
Ocean Breakup/King Of The Universe
Manhattan Rumble (49th Street Massacre)
Dreaming Of 4000