A reader writes:

I found it striking how similar the anti-porn arguments made by second-wave feminists were to conventional arguments against homosexuality from that same era: that it's a product of sexual abuse, that the people in it are miserable and mentally ill, etc. And there's another parallel: the harms that were once associated with being a porn actress, like the harms associated with being gay, were always the product of shame and stigma rather than the thing itself.

This is why the shedding of anti-sex attitudes represents progress: it means freedom and acceptance for people who are for some reason indelibly associated with sex, whether it's gay people, porn stars, prostitutes, or, well, women in general (since straight men can never really separate their attitude towards sex and their attitude towards women).