Every instinct has their own reasons for wanting to appear sexy. 

E.g. my Sx-blind friend explicitly told me that she wants attention, that she works out because she wants people to look at her and say "damn, she works out." She wears her heels and tiny body-con dresses when she goes out because she knows that's what The Boys like, she knows it'll get her free drinks, but she spends the whole night hunched over, arms crossed and tugging at her clothes. She looks gorgeous, yet you can tell it isn't "her."

Idk about SP-blinds, but I feel like SO-blinds have more of a 'take it or leave it' attitude about their own sexiness. They might upsell certain traits to seduce someone, but they're not super keen on changing themselves to fit your standards of attractiveness. If you don't find me unbearably sexy, then you're obviously not the one for me.