I've also noticed that the people who are REALLY not into anal sometimes can't get past the "anal" on the label. Even if I assure them that they can use it for vaginal, they go "Uhhhhh...no, thanks..." and buy something else. I'd actually sold one guy on a bottle of Soothe, and then his wife made him come back and return it for a "normal lube."
Personally, my favourite lube (Liquid Silk) isn't very good for anal, but I still much prefer the feel of it. If it worked better for anal, I'd have no use for Soothe or Maximus.
My friend prefers the feel of Maximus for everything, so that's all she buys.