I don't know if this is legit...
1) assign 10 flips of coin (arbitrary) to each person
2) in theory each person shall end up with 7.5 heads and 2.5 tails. but with a small number of flips the uncertainty will be larger and each person will likely end up with a different number of heads and tails
3) date with the guy with more heads :) or repeat until one guy has more heads
there should be a better way of exploiting the probability of getting certain number of heads and tails, but I'm not a stat person so I can't tell. maybe use poisson distribution?