When I type that search term in I get this adwords ad at the top of the listings:
http://www.PheromoneTalk.com What The Sellers Here Don't Want You to Know. It'll Freak You Out!
Note the spelling mistakes ;-)
Anyway when I clicked through I get a surprise - It took me to this forum:
And look what is at the top of the forum - a promotion IF YOU JOIN THE FREE FORUM TODAY to get $25 in free pheromone products
Now as you can see every man and his dog joins the forum immediately.
What you get is a $25 coupon for their web store here: http://www.androticsdirect.com/home.php
Where oddly enough all the products seem to be more than $25
Not only that but pheromones are a repeat sale product that you must keep purchasing.
In short a brilliant way to build a forum, a customer list and generate repeat sales.