A good, if somewhat disreputable, buddy of mine in Southern California who'd bedded a significant number of women he'd met primarily at dive bars once summed up his philosophy of getting girls to me like this: "Just get 'em drunk, bring 'em home, get 'em more drunk, and have sex!" Ah, the age-old combination of sex and alcohol.
People've been doing it that way since the Ancient Greeks were sporting togas and spears. Sex and alcohol have gone hand-in-hand in human society for a long, long time. Stands to good reason there ought to be some good reasons for it, then, too.