Men who grew up without sisters are sometimes a little behind the curve in knowing certain things about women. Sexual Education class in school (if they even took it) only covers particular things, and we all know teenage boys were more interested in putting condoms on bananas than learning about the female reproductive cycle.
It isn't necessarily their fault, some of these facts about girls can only be learnt through lived experience. Which is exactly what one Reddit user thought when they asked the question: Males who are heterosexual and grew up without sisters: what girlfact did you only learn when you started dating one? This AskReddit thread highlights some of the hilarious things the poor dears didn't find out until later on in life.
"I had no clue that the string on the bottom of a tampon was to pull it out when you wanted to change it. I thought for sure that a girl stuck the tampon in, pulled the string, and it expanded like a mini explosive. Kind of like a rip cord and a parachute. I was clearly wrong."
"My very period-sympathetic boyfriend thought, up until a few months ago, that all the blood during a woman’s monthly period comes out all at once. In some massive torrential wave. (Apparently, we only wear tampons/pads for longer because we don’t know exactly when the flood is coming…)"
"I’ve lurked reddit for a while now, but I had to create my own account for this one. I never had any sisters and started dating my girlfriend a little over a year and a half ago. Well, one day within the first month or so of dating, I noticed she had some skid marks on her panties. I was thoroughly disgusted, but she’s awesome, so I let it slide. I later saw that she had more than one pair of skid marked underwear, and it remained a mystery as to why this awesome girl either A) had really bad diarrhea often or B) had no idea how to wipe her own ass. Again, this didn’t affect me too greatly, but I did find it to be a little odd. Fast forward a few months, when we went to visit her mom at her apartment. My GF’s little sister, who was 17 at the time, lived there as well. I went into her little sister’s room and saw she had panties on the floor… WITH SKID MARKS. I was aghast… Could this be a family issue? I couldn’t take it any more and I just had to ask my GF if she wasn’t raised with proper ass wiping technique. She laughed and told me it was period blood, and that girls have a few pairs of underwear they use specifically if they’re on their period. The world made a little more sense, and I was so relieved my girlfriend knew how to properly wipe her ass. I also felt like a dumbass.
TL;DR – Period blood stains sure look a hell of a lot like skid marks."
"i told my boyfriend about my first gynecology appointment and was joking that the first time i got fingered was by a big female doctor (see principle from the movie matilda). he started fidgeting, turned pale and asked me why gynecologists have to finger women’s buttholes. he thought gynecologist=butthole doctor."
"My boyfriend thought “morning sickness” (meaning you are pregnant) occurred the morning directly after you’ve had sex. He freaked out when I had a stomach flu one morning after staying over."
"That they’ll tell you they’re not hungry then eat the food off your plate one piece at a time."
"Bobby pins, bobby pins everywhere."
"The financial burden of makeup."
"that they actually will fall in the toilet if you leave it up.."
"'Why would we care how long your limp penis is?'