Well, you can grind if it´s what you want. Or you can just let´s the vanilla girls be vanilla and have a vanilla relation with them and let´s the perverted girls be perverted and have a BDSM relation with them.As an aside, minor grumble: The grind to get rid of Vanilla is kind of ridiculous, even with Touch of Adonis.
If you want to peg a square nail in a round hole, for sure it would take time, grind and effort. But you have lot of nails to choose between...