“…Looking at current literature on ovulatory changes in general, the predominant finding is that women show increased sexual motivation when they are fertile (Arslan, Schilling et al, 2018; Bullivant et al, 2004; Jones et al, 2019; Roney & Simmons, 2013, 2016; Shirazi et al, 2019). While the nature and function of these shifts remain a matter of debate (Arslan, Schilling et al, 2018; Gangestad et al, 2005; Havliček et al, 2015; Pillsworth et al, 2004; Pillsworth & Haselton, 2006; Stern et al, 2019, 2020), one hypothesis that is gaining more attention and empirical support is the motivational priority shifts hypothesis (Roney, 2016; Roney & Simmons, 2013). According to this hypothesis, estradiol and progesterone act as a two-signal code that promotes mating effort during the fertile phase, when reproductive fitness benefits outweigh the costs (risking injury, sexually transmitted diseases and opportunity costs with regard to e.g.…”