[waterhouse]

The desirability of an individual is often strongly influenced by heritable traits. In the example with my interpretation, "beauty" is a trait we assume to be desirable (for the sake of illustration I'm assuming it's the only trait considered), and how much of it an individual has is heavily influenced by the coin-flip gene. I see no contradiction here.

I might interpret the sentences you quote as "We can give each individual a beauty score from 0 to 100, and all members of the opposite sex agree on what beauty score an individual gets." And we might imagine the coin-flippers have beauty in the ranges 90-100 or 0-10 (depending on the flip result), while the others are all between 40-60 beauty.

[brenschluss]

> The desirability of an individual is often strongly influenced by heritable traits.

I don't disagree with you, but that is not what the paper states, and that is not how the paper defines desirability.

I am not saying that the paper's definition is correct for a broader understanding of biology. Rather, the paper's stance is to generate a simple model and to prove an argument within that model. I am saying that, within the definition that the model is using, the model is internally incorrect.