First drink while you're having your diaper changed
There is no legal drinking age in these countries; you can enjoy your first drink while you're having your diaper changed: China, Nigeria, Poland, Portugal, Thailand and Vietnam. It's 16 most European countries.
Source: Potsdam University site “Alcohol Poblems and Solutions at potsdam.edu/hansondj/LegalDrinkingAge.html
Nigeria: I wouldn't be cheating
There is another very real and terrifying perspective on adultery (called "zina" in Islam Law), pointedly set out in this extract of the Penal Code of the northern Nigerian state of Zamfara, Ch. 8, s. 126 (at zamfaraonline.com/sharia/ chapter08.html):
"Whoever, being a man or a woman fully responsible, has sexual intercourse through the genital of a person over whom he has no sexual rights and in circumstances in which no doubt exists as to the illegality of the act, is guilty of the offence of zina (and) shall be punished with caning of one hundred lashes if unmarried, and shall also be liable to imprisonment for a term of one year; or if married, with stoning to death."