The secret with woman and cologne is sense memory,
If you happen to luck upon a scent that reminds a woman of a happy memory (first love, first crush, etc...) you're in luck.
With woman their sense of smell is very tied into their memory.
However the reverse is also true, for example wearing a scent that some guy who dicked her around use to wear, and you're heading for an uphill struggle.
I am talking in broad generalities here so take all this info with a grain of salt.