In order for Langton's claim that pornography silences woman to be true, it must also be true that pornography is authoritative when it comes to sex.

Pornography is only authoritative when it comes to sex if the government proclaims that it is.

Langton's claims that pornography subordinates and silences woman are true regardless of whether pornography is authoritative when it comes to sex.

The claim that pornography silences women is more significant than the claim that pornography subordinates women, because it concerns women in general rather than women acting in pornography.