Nothing says "For children who want to be adults" Then a F-Bomb.
Do you really believe this? Imagine watching The Terminator or Alien or The Dark Knight without swearing. It's extremely hard to name decent film targeted at adults that does not have any swearing. Yet people are still tied to the idea that all video games are targeted at children by default.
Personally, as an adult, I would like Larian to treat me like an adult, and include adult themes like swearing/sex/nudity in a mature way.
As it is, in Divinity: Original Sin, you teleport into a bathroom while a woman is bathing just as a cheap joke, but you seem more worried that she might swear when she tells you to get out.
Divinity: Original Sin is immature, and it didn't need swearing to achieve that.