The more deer there are, the less the deer go though the traditional scrape and all of that. I believe bucks use their eyes in open areas before does are real hot and I think does will urinate when a buck starts pestering them and lots of times this determines if the buck stays for a while or takes off in pursuit of another more receptive doe. The does will urinate to advertise their receptiveness, but they will also urinate to let the bucks know that they are not close or that they are already bred.
Once during the late doe/spike season, 2nd weekend in January, a doe passed my stand at a good distance and I watched where she went until I could no longer see her. In the next 2 hours 7 different bucks followed that exact trail. I am sure the scent had varying degrees of strength from 1st to last buck, but they all followed it to the tea, so their smell power must be pretty incredible.
Tired, Wired, and Uninspired