Many of us don't worry about gender designations in fragrance — we wear what we like. I think this is especially true for those of us who wear fragrance primarily because we want to smell something good (or interesting, or thought-provoking) as we go through our day, or, as Tania Sanchez so nicely phrased it in Perfumes: The Guide, because it's "a substitute for having an orchestra follow you about playing the theme song of your choice".
Every so often I have to stop and remind myself that that is not why the vast majority of consumers wear fragrance. Most consumers wear fragrance to smell good to others, or to attract the opposite sex. If that is your aim, many of my own personal favorites (Monocle + Comme des Garçons Scent One: Hinoki comes to mind because I happen to be wearing it right now, and it isn't exactly what I'd choose as a weapon of seduction) might seem perverse, to say the least.
I don't know if Scent: One: Hinoki has a gender designation, but if it did, it would probably be masculine, and it isn't something I'd recommend for a first-time borrower — that is, someone who was just starting to explore the concept of wearing fragrances intended for the opposite sex. So for interested neophytes, let's start a list of fragrances that are "easy" to borrow, or that can be easily layered to "tilt" the gender scale in the right direction.
I'd start off with two men's fragrances that have been "borrowed" successfully by women for years, and that were in fact two of the first men's fragrances I ever bought: Christian Dior's Eau Sauvage and Guerlain's Vetiver.
There, I took the easy ones, you guys add the rest.