Most men weren’t taught how the menstrual cycle works - and that gap quietly damages relationships. Flo’s own research found 58% of men don’t know how long a cycle lasts. 60% of women say their partner’s ignorance affects the relationship.

Here’s the thing: when partners understand the cycle, relationship satisfaction goes up for both people. And her symptoms actually become less severe.

This is the guide that didn’t come with the relationship. Four phases. What’s happening. What to do about it.

The four phases

Guides