I love high heels, but I love other feminine shoes too. StacyCD made a valid point. Unless your foot size is the same as your SO's, you will likely stretch her shoes if you wear them often enough. My SO, who does not know about my dressing, loves shoes. One pair of sling-back pumps that I like ended up getting so stretched that they wouldn't stay on her feet. She didn't understand why this happened, and I certainly wasn't going to tell her. I had also broke one of her shoes once.
Occassionally I have purchased entire outfits for her, including shoes. I thought that I would be smart and purchase strappy sandals in a size larger than she normally wears so that I could wear them comfortably too. That kind of backfired because the shoes ended up being too loose for her to wear. While I love wearing sexy shoes, I like seeing her wear them too; and shoes that are too large for her, are shoes that I won't see her wear.