I dont think you are correct there at all. There ARE some laws which involve border crossings - for instance, we have laws here regarding visiting another country with the intend to have sex with or marry children. The crime is still commited on german soil as its about planning to do such things while still here.
Whats relativly common, actualy, is crossing into other countries to take drugs which are legal there. Travel companies organise an exceptional amount of trips to the netherlands for that reason and purpose.