Is There a Difference Between Menstruation and Fertility?

In the typical 28 day cycle, women go through from menstruating to like building up the uterine lining that can potentially get pregnant. If you have sex a couple days before ovulation, you're most likely to get pregnant and you ovulate. So there's a lot of evidence now that these cycle effects also kind of nudge female preferences in different directions. But be aware that she might like you better next week than she does this week.