Too much time on my hands, so I tried to list the women in Ross' life.
1 Carol 2 Julie 3 Rachel 4 Bonnie 5 Chloe 6 Emily 7 Amy
There was also the lady he met while standing guard over his dissertation at a college library, not sure if she counts.
Ladies who don't seem to be eligible for the list:
Carol's partner Chandler's mom Janice
I'm sure I'm overlooking people...