It says on the back of the cover that the game contains violence, bad language and SEX.
Violence => Okay, because Guybrush punched someone AND because of a certain Episode 4 cliffhanger/Episode 5 finale.
Bad language => Pox infected pirates when going angry
However, in the STEAM version I didn't notice SEX.
Is it something hidden on the collectors edition, or is PEGI (the people who apparently rate games these days) just pulling my leg :P
Unless of course, PEGI considers flirting dialogue being equal to sex ;)