D”Y I actually DO advocate for more than one “yes” (having married my wonderful husband because I said yes to a date while on my way to preparing for another date, something which most girls of my generation did), because it is unreasonable to expect a girl OR a guy (but more often it is the girl) to wait and wait for a response when another shidduch is potentially available, and could be lost. It happened exactly that way to my friend’s son. He missed out on a shidduch that on paper sounded PERFECT for him, for his family, and so on, because the girl was being redt another possible shidduch (it had not gone beyond a preliminary inquiry), so she would not allow her info to be given out to him. In the meantime, he was redt to someone else, (it didn’t end up working out), and the first girl became available, but now HE was “busy.” By the time he had seen the present girl twice, he realized it was not for him and he wanted very much to meet the first girl, but once again, by that time she was waiting on a response from a new boy. They never did meet each other, and I make no apologies for feeling that this is a real shame.
The “rules” today benefit no one. We have a greater shidduch crisis than was ever seen in recent history, and my bottom line says, whatever it takes to get our single people married, should be considered, even if it means “double dipping” or (horrors!) going to Single events that are NOT shiurim. That is my opinion, and whoever wishes to, may disagree (my own kids disagree, but then again, they have also been brainwashed about the rules).