Men like to have their brows groomed and gone are the days of letting the barber loose on them with the clippers. Today it is a popular treatment offered in salons and spas and so much so that 'Brow Bars' are doing a roaring trade. http://www.blinkbrowbar.com
Subtlety is the key, not making it look too overdone. Avoiding creating arches and leaving in a few stray hairs keep the brows masculine but defined.
The treatment takes around 20 minutes and can include plucking, waxing, threading, tinting and filling in with powder or pencil to create a natural and strong look.