itch.io

Their functions have not been implemented (was planned as a kind of easteregg). Congrats for finding them, though.

If you go a certain route in endings, you can still watch a missed sex scene from the other ending route   by giving it to the character that  the token description hints at. Might only work if you  are already in the other ending route  and waited a  day. And I cannot recall if you have to gift it or use it at location of character.

You can give it to Gwynn on last ending route (Goblin King), so you get achievement in gallery in the end.

You can see the scene on Gwynn Demonologist route ending w/o using token at all, nevertheless.