The ovulatory shift hypothesis is the scientific hypothesis that women experience evolutionarily adaptive changes in subconscious thoughts and behaviors related to mating during different parts of the ovulatory cycle. Some studies have demonstrated evidence in support of the ovulatory shift hypothesis while some reviews have failed to show significant effects for some predictions of the theory. Two meta-analyses published in 2014 reached opposing conclusions on whether the existing evidence was robust enough to support the prediction that women's mate preferences change across the cycle. Some researchers who found an increased preference for masculine traits near ovulation within each cycle also observed variation between cycles―in all cases, attraction towards "high testosterone" men was