After Mr Dang65 suggested a beer goggle lens for cameras, having snapped Sharon Stone at the oktoberfest and ended up with a picture of Susan Boyle on a bad day, I thought I'd contribute by writing some testcases, just to help development along.

nE; number of beers required for beauty to enter the eye of the beholder
nO; number of beers at which the male organ ceases to function
nC; number of beers consumed

Where;
TC1 nC < nO and nE < nO then buy her a drink but get yourself a 7up
TC2 nC = nO and nE > nO then you’re probably safe, but have another drink to be sure
TC3 nC > nO and nE < nO you’ll have to wait for tomorrow and have a pot noodle in the morning
TC4 nC > nO and nE > nO not necessary, covered by testcase TC2
TC5 nC < nO and nE > nO drink 5 beers immediately or you´re going to wake up next to Susan Boyle and Gordon Brown’s lovechild