Heroes do not cuss. Heroes have girlfriends, or even fiances, but appear to have chaste relationships. Which is not to say these things don't happen in a comic book world -- non-Heroes occasionally let out the occasional "*&#@!", and sex is clearly happening behind the scenes, or there would be no children in the campaign world.
Drugs is another subject we can touch on here. Marijuana and opium are known dangers in the comic book world. Heroes may have to navigate their dens, but would never think of sampling the wares themselves.
(Scans courtesy of Comic Book Archives)