 However, when it comes to legislation that interferes with free speech, the liberal presumption against legislation is especially high. For liberals take freedom of expression to be an especially important right that takes precedence over most other rights and interests (including equality) should they ever conflict. Levels of harm that would normally be sufficient to justify regulating the conduct which causes them may not be sufficiently great to justify restrictions in cases where the harm is caused by speech or expression. Hence, for liberals, justifying censorship of pornography requires that there is extremely reliable evidence to show that the publication or voluntary private consumption of pornography by consenting adults causes especially great and serious harm to others. The harm caused by expression must be very certain and very great before it is legitimate for a state to prohibit it. We would be justified in banning a certain type of pornography (e.g., positive rape depictions) only when we are very sure that, on average, tokens of that type (i.e., most particular positive rape depictions) cause very great harm.