Are there laws against pedophilia?
There are (and certainly should be) laws against sex with children and moloesting.
But even if the government wanted to get into your head it couldnt.
There are no laws against any kind of lust -that I am aware of.
You can lust for chrystal meth all that you want, but as long as you dont possess it or use it you're not breaking any law.
...
Well... there are laws against kiddy porn ( trading and possessing it). Maybe that counts.