i think it allows people an excuse to do what they would want to do when they are sober but are either too afraid to do, or won't due to guilting from society.
being stinking drunk is a convenient excuse to fall back on, for both the girls and the guys. i mean if it weren't for beer goggles some women would have to actually be forced to ask for sex. and we all know that its not very lady like to do so, and not the natural progression of the mating game.
oh yeah one more thing. apparantly, the guys better beware. it might just land them in jail.