You have to remember for what the Vaults were actually created; they were created to be places where the 'state'? (or someone?) could get to see the implications of social experiements i.e. what would happen with 1 man and 999 women
and 1 women and 999 men.
As for how it would go, I'm sure that the 999 women and 1 man would do great. Most women tend to think (or feel) a bit more logical than men in these situations. The women will probably make a list on which ones the man were to visit each week or so. And remember that all human behaviour comes down to sixual behaviour...
I don't know why but everyone has oddly become a TAD-bit more horny the second that person posted the picture. pure speculation I say. If that was filled with the users of this forum I predict failure in 2 weeks.
1. I would have destroyed the reserves of tacos considering tacos are the answer to life
2. Dr.Strangelove would have god-cheated and use his medical knowledge to get all the gals (Luck bastard)
3. Maccy man would crush everyone under his colossal fat reserves.