Uhhhh, you haven't heard of mixing? I mean, not Blockchain.info mixing, that one doesn't work. But there's even a push for CoinJoin (by gmaxwell, one of the maintainers of the Bitcoin source code).

https://bitcointalk.org/index.php?topic=279249.0

Also, regulation is about as useful as enforcement. If you ain't in the US, enforcement is pretty weak and therefore you can get away with it MANY times.