3 drinks in the average guy would barely get him over the legal intoxication limit. I suspect it takes at least twice this intake before the beer goggles reliably kick in.
Just my $0.02 based on hearsay, of course, not in any way related to my college years in New Orleans. ;-)
Love, O2
A more valid methodology for the Beer Goggles test would be to put three reasonably attractive young men in a room with an objectively unattractive woman (determined beforehand, of course, by the young men’s own reactions to her while sober), and then keep feeding them beers until they hit on her.
I imagine every man has his own beer goggles intake requirements, so guy #1 might take 6 beers, guy #2 takes 8 beers and guy #3 might have to pass out in his own vomit before he decides to make his move.