Have you ever just asked her? And did she turn you down? If the answer to both those questions is No, then that’s what I would suggest. If the answer is yes, then you may be stuck, but here’s one suggestion. Give her a gift certificate to a salon that gives all sorts of treatments, including a bikini wax. Maybe if she knows that she’s going to get a facial and her nails done she’ll agree to try a bikini wax. I won’t tell you that she’ll agree to it a second time, but see if you can “bribe” her this way and let me know what happens.