I would love to see D:OSII have the similar language and sexuality as the first. It's one of the reasons I enjoy the first so much. It's clean, my kids (4 an 6) like to "help" me by suggesting things and I like knowing that if a surprise pops up, it's not going to be vulgar or sexual. I think a happy medium is make up their own vulgar words, the Wheel of Time book series did a great job of this.
Just my thoughts. I don't want to ruin it for anyone else, but would adding vulgarity and sex really add that much to the sequel?