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99% of people I dance with start by offering me their left hand. I give them my right hand, come close and embrace them with the left, then they put their right hand around my back closing the embrace.
Im in Lily's 99%. The woman then chooses either a V embrace, closer to the closed side, or a more parallel embrace.
OMG, if someone explicitly used their hand to prevent me from taking a comfortable position within the embrace that would be the end of it.
Never happened to me though. Sometimes in a practica someone asks "could we please practice in open hold", but that's about it.
That's the case where I'd use my left hand. If it's the beginning of a tanda, I'll cabeceo then enter the floor positioning myself facing line of dance. The lady steps in front and I can invite with my right.When he isn't already holding one hand to take me onto the dance floor, then it varies, although offering his left hand first is most common
I also didn't say it prevented me from taking a "comfortable" position.. I said it prevented me from taking a flat-on parallel close embrace (milonguero type).