Many years ago, when I was young and innocent, I met a Swedish backpacker recently back from Thailand. Over a couple of drinks, he explained to me the curious phenomenon of Thai ladyboys. Known as katoeys, these highly decorated gender-benders can be seen practically everywhere. I asked my new Swedish chum what on earth you would do if you pulled one and didn't realise your mistake until rather late in the game. "Anything you like" he said with a grin.

For those who don't want to get more than they bargained for, I've cobbled together a biological check-list below. Mistakes happen more frequently than people let on. Would you brag about it?

This photo of the Miss Lady Lady International contest appeared recently in the Bangkok Post. The one in the middle is obviously a fella, but what about the other two? The one on the left looks like a real babe, but a babe is the one thing she is not. In fact, all three have that little bit extra - namely a big fat veiny knob or, at best, one that has been inverted by surgery.