Half the population of this planet has had or will have a period. Most guys have women in their lives (as friends, family, or S.O.). Why should we be ashamed to talk about our periods with men? It just means we're female in our reproductive phase of life. If a guy is uncomfortable talking about periods, that's his issue. And if male Ts shy away from the topic, then they shouldn't treat women.

I do get moodier around my period. It only lasts a few days. For me it's minor. For others it's more severe. Like some others have posted, maybe it PMDD.