Fifty Shades of 'What the ...?'

The phenomenon is common in medical science. Researchers know that a particular medicine or compound works for a particular condition, but they often don't know why it works.

The same can be said about Fifty Shades of Grey. We know that it works. But we don't know why.

And by "works", I mean ... as an aphrodisiac. No longer do men (notably under-sexed husbands) have to go searching the internet for products making wild claims - Spanish Flies, Oysters, etc - in the hope that it will boost their partners sex drive (towards them).