Cycle Science

It’s not willpower. It’s magnesium, serotonin, and a luteal-phase reward-seeking dip. Here’s what’s actually happening — and how to be useful.

Two hormones do most of the work behind her mood. Here’s the week-by-week map of what estrogen and progesterone are doing to her brain — and what helps from a partner each week.

Day 1 isn’t a single day. A field guide to what’s actually happening in her body the first five days of her cycle – and what your job is, biologically informed.

Ovulation explained for men: the hormonal peak of her cycle, why it matters even if you’re not trying to conceive, and how to spot the window without medical kit.

Menstrual cycle phases explained for men: 4 phases, 4 hormones, what she’s likely feeling at each — and what you should be doing. With a cheat-sheet table.

The luteal phase explained for men: what’s actually happening in her body in the second half of her cycle, why it matters to you, and what to do.

How hormones in the menstrual cycle drive her mood, energy, and desire across four phases — and why 102 studies say it doesn’t make her less sharp.

The 4 seasons of menstrual cycle for men: a plain-English field guide to winter, spring, summer, autumn of her cycle — what’s happening, what she needs, what you can do.