Let's go over this again, since some people are still having trouble with this very simple yet important concept:
What goes on in other peoples heads is none of your business and none of any government's business: Not your neighbour's, not your HOA, and certainly not the legislature or Parliament.
Text for this reading from the UN Universal Declaration of Human Rights, 10 Dec 1948: http://www.un.org/en/documents/udhr/ .
No law which affects or is based on someone internal mental state is just. As a free society we may only judge people by their actions, and hopefully only those actions which affect the rights of others. Please stand against thought crimes!
Next lesson: Pornography is good.