Challenges to both reliability and validity of masculinity-preference measures in menstrual-cycle-effects research

Although it remains contentious, women's changeable attraction to masculine faces has been used to inform evolutionary ideas about human mating strategies. Typical experiments in this area use two-alternative-forced-choice (2afc) over a few pairs of similar images. The reliability of these measures is analysed suggesting that many studies have too few trials to be reliable. In the current experiment, fertility shifts in preferences for...