Depends on what your into; BB'ing (pure or power) PL'ing, general training, sport training, etc, etc, etc..
5X5's (25 reps) all the way to 8X8's (64) or 10X10's (GVT...100 reps). General rule of thumb...less is most always better, with those 5X5's as a good starting point. For power, 3-5 sets of 3's. Singles or two's for more serious power lifters.
Try not going to failure every set, on every rep....no matter what your goals are.
Most guy's who listen to their bodies would rather have a couple of beers and a pizza.