Right, but if she also reacts like it's the most vile thing ever, it's going to be a difficult sell. Practicing saying, "I prefer fingering and direct digital stimulation, not oral sex and strap-ons" is one thing. Making it believable and making it so that someone doesn't try to do the, "But I haven't done it to you, I can do it better than anyone, just try it with me!" sales pitch will take a lot more effort. Not saying her preferences aren't valid (they are! they totally are!), but people can be assholes about stuff like that.