Yes, I have bought several. Even though our sex life is great, there's always room for improvement. The last one I bought, though, was a bridal shower gift for a friend of mine: Supersex by Tracey Cox.
I've bought several also, on a wide variety of sexual subjects. The most recent was a gift for DW, as we prepared to temporarily turn our marriage into a LDR once again: Getting Off: A Woman's Guide to Masturbation, by Jamye Waxman.
DW sometimes still hears the voices in her head telling her that good girls don't do this, so it's helpful for her to have some positive reinforcement that staying in the habit of being sexual, through the form of some self-loving, is like remembering to eat your fruits and veqgies.