Scientists reviewed 16 old studies that claimed that we do find people more attractive after a drink. The review considered a thousand people who were previously been asked to rate levels of attractiveness before and after drinking alcohol.
The study said: “Arguably, the most critical challenge facing alcohol researchers is to figure out why individuals drink.”
“Because social interactions are improved when people are perceived as attractive, it stands to reason that alcohol’s ostensible effects on perceptions of physical attractiveness may lead individuals to derive more reward from social interactions while intoxicated, which may in turn reinforce alcohol use.”
Therefore, drinking increases the chances of making you believe that the people around you are more attractive than they are in reality, and this is why you end up being more flirtatious.