I believe that men's lack of instinct is entirely cultural.

We're a society of 'reason' and power. People who hold power are supposed to be 'reasonable', that is the only mental trait they are allowed to use is their logic. The 'irrational' mental traits; imagination, intuition, instinct; are ones actively hunted down and suppressed. For a long time only men were in power, so men were the ones who suffered most from this process.

But you can see in women that rise to positions of power these days suffer from it as well.

Read John Ralston Saul's book Voltaire's Bastards: The Dictatorship of Reason in the West for a full exploration of this.