Ultimately, the problem is that sex is perceived as a personal, intimate thing, not in the realm of science. But that's not true. It's physiology; it's anatomy. It deserves to be studied.
Any time you can take a book a little beyond the realm of pure entertainment, I think it's a good thing. But I don't really have it on my to-do list when I write a book. It just evolves naturally during the process of immersing yourself in a subject.