If you take a chick (if you're a guy)out on a date and it isn't going too well then take her back to your place. Then when she goes to the toilet strip down bollock naked and when she comes out, 2 out of 3 times you get laid.
Three guys go on a triple blind date
they each take their respective partners back to their flats and they meet up the next day.
1st guy: did you do the naked man rule?
2nd guy: Yeah . it worked BOOM
3rd guy: for me third guy unlucky