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Go to a store and have them spray on cards the colognes you're interested in. They should have a bag of coffee beans, as well; sniff that between sniffing cards, it'll clear the previous scent. Once you've narrowed it down to a couple, make sure and spray your own skin to make the final determination, since your body chemistry will make certain scents smell better/worse. Oh yeah, and remember that when applying cologne, only people that are within your arm's length should be able to smell it. Think it was Demetri Martin who said he thought it was funny that cologne rhymes with alone.
For cologne spray ONE SPRAY in the air and walk through the falling mist. That's it!
I think there is a large number of ladies whose favorite scent when up close is just the smell of clean skin. So a second shower of the day might be a much better strategy than cologne, and you don't run the risk of putting on too much, putting on a kind she doesn't like, or finding out she's allergic
“Most men lead lives of quiet desperation and go to the grave with the song still in them.” --Henry David Thoreau