>>151131169
I remember a xeno rosemary fic I read once where it was normal for trolls to start fucking out in the open, especially at parties. Caste and social status and alien(human) fucking would of course contribute to whether an encounter was scandalous in the eyes of others though. Wish I could remember it

As for the trolls we know, you do have to remember that Alternia was a planet of kids. Karkat, Vriska Kanaya etc acting blushy about buckets is probably just because they were teen virgins, in a culture of teens.
There's probably no shame for adult trolls who've been fucking for centuries. They probably flaunt their bucket score after a party