It's a mix here. There's definitely a bohemian atmosphere (in many, not all parts of the city), but reducing that to sex and drugs isn't really fair. It extends to arts, street culture, work environments, etc. I think I see what you're getting at though, so I'll give a few specific examples of rules that are broken here:

- "Living in a big cultural center is expensive." It's cheap here. I don't know of any other western cultural center where that's true. 3.5 million people and there's a housing surplus. This has a huge effect on the city.

- "You need a lot of money." A side-effect of the above, there's a real de-emphasis on having cash here.

- "You should have a normal job." For good and bad, there's not much big industry in Berlin. Most of my friends either work independently or in relatively small companies. Most of those companies aren't startups in the sense that we use the word here, but small businesses that do well enough.

- "You need to grow up." You can still go out here when you're 30. Or 40. And it's not weird. And it doesn't mean you're not professional. Similarly, there doesn't seem to be the taboo against founding a startup over 30 (I'm 27 and one of the younger guys at the meetups I've been going to.).