When you start putting the pieces together. You knew it was a trap all along to get your clothes off and do it like they do it on the Discovery channel.
Turn up your thermostat to 77 F/25 C, give everyone some hard alcohol, start spouting about being drunk & hot so you start taking off your clothes.
Basically this is a not so subtle way of breaking the ice and getting naked. Remember ladies (men too) don't fall for this. Or you could, as long as you're aware.