It took me a while to realise this, but 2 of the quotes that this person has posted were not full quotes. I will post them here in case you are curious.

The one from 2003:

The nominee is quoted as saying that if the choice of a sexual partner were protected by the Constitution, “prostitution, adultery, necrophilia, bestiality, possession of child pornography, and even incest and pedophilia” also would be. He is probably mistaken, legally–but that is unfortunate. All of these acts should be legal as long as no one is coerced. They are illegal only because of prejudice and narrowmindedness.

Some rules might be called for when these acts directly affect other people’s interests. For incest, contraception could be mandatory to avoid risk of inbreeding. For prostitution, a license should be required to ensure prostitutes get regular medical check-ups, and they should have training and support in insisting on use of condoms. This will be an advance in public health, compared with the situation today.

For necrophilia, it might be necessary to ask the next of kin for permission if the decedent’s will did not authorize it. Necrophilia would be my second choice for what should be done with my corpse, the first being scientific or medical use. Once my dead body is no longer of any use to me, it may as well be of some use to someone. Besides, I often enjoy rhinophytonecrophilia (nasal sex with dead plants).

Source: https://stallman.org/archives/2003-mar-jun.html

The one from 2013:

There is little evidence to justify the widespread assumption that willing participation in pedophilia hurts children.

Granted, children may not dare say no to an older relative, or may not realize they could say no; in that case, even if they do not overtly object, the relationship may still feel imposed to them. That’s not willing participation, it’s imposed participation, a different issue.

Source: https://stallman.org/archives/2013-jan-apr.html#04_January_2013_(Pedophilia)

The one from 2006 was a full quote, but that post contains a note now:

[Many years after posting this note, I had conversations with people who had been sexually abused as children and had suffered harmful effects. These conversations eventually convinced me that the practice is harmful and adults should not do it.]

Source: https://stallman.org/archives/2006-mar-jun.html#05 June 2006 (Dutch paedophiles form political party)