I just learned that the etiquette in the United States (and I presume Europe) has been for married people to switch partners for 300 years or more for ballroom dances. My understanding may not be perfect, feel free to correct me, but from what I have read married people generally don't switch partners at Buenos Aires Milongas. Friends of mine have told me stories that when they did Tango tourism to BA they would pretend to not be married to each other to the point of showing up at a Milonga at different times, and would ignore each other at the Milonga, or the locals would not dance with them. So if my understanding is right, the question that comes to mind is how and why did the cultures diverge in that regard? What are the ground rules for married men or women to be doing Tango with people besides their spouses? BTW, no slam is intended towards JanTango or my friends -- I'm just interested in understanding the cultural differences. As long as I'm on a roll here, people that have been to BA with their spouse: Did you have to enter Milongas at different times and ignore your spouse? Perhaps things like that just trying to put an adventurous twist on Tango by the dance schools?