In 2003, psychologists at the University of Glasgow, UK, published a study in which they asked heterosexual students in campus bars and cafés whether they had been drinking, and then got them to rate photos of people for attractiveness. While the results supported the beer goggles theory, another explanation is that regular drinkers tend to have personality traits that mean they find people more attractive, whether or not they are under the influence of alcohol at the time.
To resolve the issue, a team of researchers led by Marcus Munafò at the University of Bristol in the UK conducted a controlled experiment. They randomly assigned 84 heterosexal students to consume either a non-alcoholic lime-flavoured drink or an alcoholic beverage with a similar flavour. The exact amount of alcohol varied according to the individual but was designed to have an effect equivalent to someone weighing 70 kilograms drinking 250 millitres of wine — enough to make some students tipsy. After 15 minutes, the students were shown pictures of people their own age, from both sexes.
Both men and women who had consumed alcohol rated the faces as being more attractive than did the controls (Alcohol and Alcoholism, DOI: 10.1093/alcalc/agn065).
So guys, if you're ugly, get her drunk!"