Gentlemen,is it part of the lady's responsibility to help keep a couple on time, whether she is a social dancer, competitor or instructor?
Ladies, what do you think?

no, because there are a variety of possible timings.

Annie, Both couples must know the timing and dance in time. In Latin in particular where some moves are performed apart from each other. A knowledge of the timing is a must. If you have a male who is dragging you off time, then sit them down and play a disc and teach them how to count each bar of music untill you are sure that they can hear the beat and can count,, this is any dance. I used to count a Foxtrot putting a tick on a peice of paper every four beats right to the end of the disk., then add them up. Don't be suprised if you finish with a different number at first, especially if the disc has a singer on it.