A friend just pointed out this lovely video from a bizarre group called Videojug. Their motto is "Life explained. On film."
This particular video is How To Avoid Trapped Arm Whilst Cuddling In Bed.
There's another one that's also very funny entitled How to Deal with Odd Sexual Requests. Both of these are narrated with particularly delicious English accents.
There are dozens of other cool videos at the Videojug website on all sorts of topics. It's not just things that happen in bed: there are things like How to Make a Shaker Cocktail, How to Use the Slash Punctuation, and How to Read a Knitting Pattern. Go check them out!