Unnatural because females take children inside them, have a body to feed them and have that mothernal instict, touch, sensitivity, a father doesn't have. In nature males are usually just there to get female pregnant, and than is always the female taking care of kids. A family with no mother figure just feels more unnatural than the one with all males.And as a female, I don't like the prospect of a girl without a mother. There is something sacred and special bond between mother and daughter, a man cannot replicate it, even an effeminte one. Sure gay men can surely be great parents and raise great behaved kids, nobody said otherwise, but it will always feel a bit unnatural to see kids raised by only males.