In the ten days that I spend chasing after the best teachers of tango in town and going to milongas &mdash which don&rsquot start until midnight and don&rsquot end before 4am &mdash I live in a blur of sleeplessness, melancholy music, and the ephemeral embraces of strange men in semi-dark, seedy night-halls. The tango scene is complex and you must know where to go. There are dances in clubs every night and some of them are conservative and closed to outsiders. I spend one night sitting at a dance-hall full of middle-aged couples and groups characters out of a Fellini movie. Women of sixty with super-mini skirts, enormous hair and jewellery so shiny it hurts to look at it, dancing with immaculately turned out gents with creaky joints young willowy women with splits in their skirts all the way up or tight trousers that start way below their pierced belly buttons (the women of BA are among the most beautiful in the world). Here are stunning dancers who have danced every night of their life for decades, rubbing shoulders with appalling, hopelessly club-footed tango-lovers who will never give up the wrinkled, trembling, old dancing with the vulgar young the enormous with the anorexic the tobacco-stained Peruvian immigrant with the plastically enhanced woman of society. Tango is a curious equaliser, an obsession that transcends boundaries. Tango should be danced like a one-night stand, the Code says with absolute passion, but without a future. Even after wrapping your legs around a stranger, it would be unusual for him to ask for your phone number, no matter how sticky with your sweat and perfume he is. It is a Code written by men tango is a male-led, male-initiated dance which postulates that an invitation to dance is offered by a flicker of the eyes and accepted by a barely perceptible nod. Thus, I see a woman next to me get up and walk towards a man who is advancing from the other end of the hall they have exchanged The Glance. It&rsquos a thrillingly old-fashioned device. Experienced male dancers generally have the snobbery to wait and see you dance with others before they decide whether you are worth the glance of invitation. I spend hours beholding in my peripheral vision statuesque tangueros lurking in dark corners, watching me wait and never moving my way. It&rsquos tough on the BA tango scene &mdash but worth it.