i would suggest placing the brief slightly higher in the back, and then, when you fasten the tapes, don't stretch or pull them too tightly. Make sure your hands are clean (no zinc oxide or vaseline) of course, but then press them down with some pressure with your fingernails. Chances are, there has been a run of tape tabs on which the adhesive is not aggressive enough. If you wear regular underwear (tighty-whities) over top of the brief, this will help in more ways than one. One last tip: I keep a roll of white duct tape (dollar store stuff is good enough) in my bathroom and tear off a strip approximately half inch by 2 inches and I tape over the tab and onto the landing zone of the front of the brief. This works every time- unless there is some kind of grease on it. When that happens, just wipe it off with a tissue and rubbing alcohol, and try again. Good luck.