Where did I come from?

Sexual preference chemical found in mice

What does serotonin look like and where can I get some? Oops, I've just found some tatooed on a bloke, it is a bloke, isn't it? at Neurotopia, where else?

Check out this BBC new story - it's quite short. It couldn't be that simple could it?

The spoiler is that the article concludes with:

At this time therefore any potential links between serotonin and human sexual preferences must be considered somewhat tenuous.

But every academic article with its salt, concludes with caution not to over-generalise.