While I agree with your sensitiments on vanilla, I don't think most participants are here for love.
I saw Shona's Instagram, she does not come across as the person she has given impression of in the show.
She was in preforming arts before joining the series, she seem to be playing a role in the show and seems like the ream objective is same as dor many other participants- future opportunities to build career whether through reality TV shows or podcasts or instagram.
Her highly sexualised photos for public on instagram does not make her look like a vanilla. Vanilla people dont go posts such photos. She comes across adventures type, who is living her life to the fullest. This show is just a platform for her.
So, I think most participants are playing a role here.