From Chateau Heartiste: There are theories why men find it so difficult to cold approach women and chat them up with the goal of bedroom hijinks, some of which might have predictive power. Finding the source of men’s approach anxiety would help motivated and aspiring womanizers figure out plans of attack to overcome the AA psychological hurdle.
(It is plausible that approach anxiety evolved from a reality of the distant EEA past when chatting up a strange woman in your tribe or a neighboring tribe could easily get you killed by her brother, father, lover, or the jealous cavebeta orbiter.)