It could mean that there are some stories related to sex that one doesn't want their mom to know. Maybe these stories are considered inappropriate or private to share with a parent.
One appropriate mom - friend story could be about two moms who meet at their kids' school. They bond over their children's similar interests in art. They start sharing tips on how to encourage their kids' creativity at home, like setting up a little art corner. They then become good friends and often take their kids to art galleries together.
A mom's trip to a big city like Paris could be really interesting. She visits all the famous museums, admires the architecture, and indulges in delicious pastries at local cafes. She might also take a boat ride on the Seine and just soak in the charm of the city.
Sharing sex stories with parents would be extremely uncomfortable for everyone involved. Parents have a different relationship with their children, and such topics are not meant to be discussed in this context. It goes against the norms of family communication and respect for boundaries.
The 'Don't Tell Mom' comic is mainly about the mischief and secrets that kids try to hide from their mom. There are lots of funny moments and touching friendships. It's a great read for all ages!