You can select the booster category in the bottom of the browse girls screen. Select blonds, hit ok, go to the top, the blonds ad is there. Then click the ad. Works for them as long as you have enough of that category left to buy. The boosters are; blonds, brunettes, duos, stockings, bikinis, big boobs. Currently I am waiting for another duo because there are 5 available and you buy 6 at a time, therefore, the ad does not show.