This has been coming up more and more as dancers (online and off) have been discussing the merits (and pitfalls) of using the cabeceo at milongas. Here's one example of what often happens... As soon as the cortina starts, especially if the milonga is very busy, leaders scramble to find their first choice next partners in scattering dancers. Because people are seated somewhat haphazardly and there's no single point of exit from the pista - visibility is tricky, even if the lights are brighter (which is rare). So gentlemen have little choice but to walk up to the table where their intended follower is sitting and simply ask her. Knowing that the milonga is usually set up poorly for the cabeceo, the follower accepts invitations that way, rather than appearing rude and declining an invitation, and "punishing" the leader for asking in the only way he had the opportunity to. So we usually accept the invitation. There are times when it would be even more prudent to turn dow...
"El infinito tango me lleva hacia todo" - Borges