For me, it's definitely EUF. It's what I first associated with sexuality, probably because women's underwear was considered private and seeing it was scandalous (I honestly hated it about a decade ago when it was considered socially acceptable for a few years for a woman to wear a tank top or spaghetti top with her bra straps showing like it was no big deal
). I like the humiliation factor of a woman being reduced to her unmentionables and the shame associated with it, along with the feeling of being vulnerable in her undies and the sexual precariousness that comes with it.
ENF is also fun, but I prefer when EUF is the lead up.