This therapist does have protected sex if the tip is big enough. It's insinuated when she discusses a tip.
She is primarily a massage therapist who gives all her male customers a happy ending using massage oil that she
squirts onto her hands from the bottle, then uses her hands on their penis.
Male customer after customer all day...she probably doesn't disinfect the bottle, she might wash her hands.
Is there any danger for any of her customers of catching anything at all?