Why do girls' dormitories post no entry for boys, while boys' dormitories don't post no entry for girls?

Because generally speaking, boys are more curious than girls, many boys will try something new out of curiosity, and only a few girls will do something out of curiosity. Therefore, most girls' dormitories will post notices prohibiting boys from entering, but it is rare to see that girls are prohibited from entering in boys' dormitories.

Part of the reason is that girls' sense of shame is much greater than that of boys, just as boys can take off their shirts in summer, but it is rare to see girls take off their shirts or lift their clothes because of the heat, which is also related to the constraints on women in the old society.

In people's general impression, girls are a more vulnerable group than boys. Assuming that girls enter the boys' dormitory, the risk factor will be higher than that of boys entering the girls' dormitory. Women have always been a vulnerable group in society. Although there are many feminists now, their status has not changed much.

Psychologically speaking, girls are generally older than boys. Girls will consider their own safety and won't do anything that puts them in danger, while boys may try something they haven't tried out of curiosity. This is the essential difference between the two. Adolescent girls are generally very thin-skinned, and will not do such a thing as entering the boys' dormitory, while boys will be curious about the girls' dormitory. Girls may be curious about boys' dormitories, but they are afraid to go in when standing at the door.