You'll need to look as manly as possible for this, so tell your girlfriend NO wax! NO! Real men have hairs not only on their legs, face and head (and armpits), but all over their bodies! chest, back, arms and feet (like a hobbit). And you need to get in the best shape of your life! From now on you're in a strict training regime- into your local boozer every single day for a minimum of six hours solid drinking, you have to build up a good manly beer-belly, and of course man-boobs are always a great point scorer at these contests. Can you belch loud? Good! Learn to belch louder! If they require you to display some sort of talent, the alcohol resistance you will inevatibly built up in training will enable you to drink a lorry of beer in less than a minute, which ought to have the crowd going wild!
See, I'm like some sort of guru or something. No seriously, I should be charging you for this advice

In fact, yes why not? £150 please, and that's slitting my own thumbs.
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Anyway, good luck if you go for it. REALLY good luck if you actually try to follow my advice