Growing up, I was always told that boys could come over if I leave the bedroom door open, and I see a lot with my friends that the girls would not be allowed to have boys over/in the bedroom/have the bedroom door closed or viceversa (boys with girls).
When I realized I may be gay and trans (masc), my parents were accepting and allowed me to have the door closed with girls because I was gay and still not with boys.
Then, I had a boyfriend and they said I could keep the door closed with anyone except my boyfriend.
Now, I’m nonbinary and bisexual. Would you allow your kids to close the door?
God no (I would never expect them to keep the door open). I know they probably are fucking, just hope they use the birth control options made available to them.
Same reason you knock and wait for them to open the door before going into their room (they probably are off masterbating)