Psychological cycle shifts redux: Revisiting a preregistered study examining preferences for muscularity

Publication date: Available online 24 May 2019Source: Evolution and Human BehaviorAuthor(s): Steven W. Gangestad, Tran Dinh, Nicholas M. Grebe, Marco Del Giudice, Melissa Emery ThompsonAbstractJünger et al. (2018) conducted a preregistered study examining whether women particularly prefer muscular bodies when conceptive in their cycles. Despite an impressive number of participants and within-woman observations, they found no evidence for a preference shift; rather, they claimed, conceptive women find all male bodies more attractive. We preregistered a separate study very similar to Jünger et al.'s, with specified analyses focusing on shifts associated with joint additive effects of log-transformed estradiol and progesterone (ln(E/P)). We performed similar analyses on Jünger et al.'s publicly available data, using an empirically vetted (though not preregistered) measure of Strength/Muscularity. They revealed a ln(E/P) × Strength/Muscularity × Relationship Status interaction effect on sexual attraction. The ln(E/P) × Strength/Muscularity interaction ran in opposite directions for partnered and single women effects largely driven by P levels. Jünger et al.'s null conclusions and claims about general preferences are premature. We offer several observations regarding preregistered analyses.

Source: Evolution and Human Behavior - May 25, 2019 Category: Psychiatry & Psychology Source Type: research