Periods are confusing for men.

The whole concept has even caused some of them to do things like label tampons “luxury items” and tell women with opinions that they must be on their period.

But some men truly have no idea what’s going on when our uterine walls shed monthly.

In a recent twitter thread started by @brownandbella, the woman asked Twitter for “the dumbest thing” a man has ever said to them about periods.

Arm yourselves ladies, frustration is coming.

My dad banned me from wearing tampons because they would “take my virginity” and also I would be used to “walking around with a penis between my legs.” Logic that he still fully believes

— Young Cami Snow ❄️ (@ThaBrunchMami) May 16, 2019

When I was 11 and he was 14, my brother asked me if periods happen on the weekends, too. When I said yes, he just shook his head and said “I’m sorry”

— ???? Sabrina Granger ???? (@Sabrina45X) May 16, 2019

My ex told me, a women’s health nurse, that the reason my periods were so long and painful was because I don’t drink enough water.

— Auntie Lexx (@lexxlugga_) May 16, 2019

i had a man tell me periods aren’t natural and it’s cause i eat meat.

— Skinleesi | Sallie Mae of Skin Care (@CruzanChoklate) May 16, 2019

I had a boyfriend mind blow that we did not pee from our vagina. I said no sir that’s a different hole. Lol he didn’t believe me I had to show him.

— G ???? (@__glm) May 16, 2019

A man in his 30s recently asked me why when we have a period it has to be blood that comes out. Literally had no understanding of what a period was. At over 30 years old. Amazing

— Lydia (@lyd___b) May 16, 2019

In sophomore year health class, after the teacher reads aloud the sidebar on ovulation:

Him: “I don’t get it. How could she not know?”

Her: “Know what? Exactly when ovulation occurs?”

Him: “Yeah. Won’t she feel a draft?”

Us: …

Him: “You know, when the egg falls out?”

— Genève (@bergerbell) May 16, 2019

I dated a 21 year old who did not realize that menstruation involved bleeding. He asked me how girls know when their period ends, and when I said “the bleeding stops.” He screamed “YOU BLEED???” and recoiled in horror.

— Victoria Marini (@LitAgentMarini) May 16, 2019

A guy once told me that he was pretty sure the organ responsible for menstruation was the liver. THE LIVER

— and ???? (@andiieeeyo) May 17, 2019

via GIPHY

Earlier this month, a woman’s text messages with a male friend went viral on Twitter after he admitted he thought periods stopped during the night.

Image: Twitter.

Of course it's not all men who think like this, just the ones who like to explain your bodily autonomy back to you.