When they leave TOGETHER and arrive at the other bar
TOGETHER they are now "TOGETHER". It creates a completely
different psychological setting and comfort level.

When they first met, they were just two people that
happened to be at the same bar. When they got to the
next bar, they were kind of "out on a date".

To a woman, this is a HUGE difference.

Then, after spending some time at the next bar (it's
late by this point), he'll ask her for a ride home, or
maybe suggest that she come over for a drink.