One thing to keep in mind, the 20/20 Video across from the French Market has quite an extensive adult rental department (at least it did the last time I checked). Although it is quite bland and I never see anyone up there. If you are going to do it in the french market, you'll want it to be very accessable and friendly so people will want to shop there. It is always packed there so you'll have a lot of people going in and out. Down further into Weho there are many other stores like this, Unicorn Alley, Drakes, etc. So that may not be the best idea. Sunset Junction is okay but it's a more het community there. And the section of Sunset in Silverlake might work because of Rough Trade being there. They have a few videos but not a whole lot, so if the gay crowd is going there, having a video store close by might work for you as they will already have bothered to find a place to park and will be up for shopping at places they can walk to close by.