Sorry Kelly, my version 13 of stata can't open your gph file. However here are some suggestions to change a histogram:
-you could try playing with the bin size to make a better visual
-you could simply drop the outliers based on how they are not representative of the rest of the sample. you could create a new "clean" variable of # of partners such as
gen partner_clean=oldpartnervariable
drop partner_clean if oldpartnervariable>100
Good luck! Biftu or Kristen might have other suggestions.
Anjana