From Laumann et al. (1994).
 

                          Contacted STD        Used condom
                           past year         last intercourse
 

# of partners
past year

     1                          1%                  13.7%

    2-4                       4.5%                  30%

    5 +                       5.9%                  31.2%
 
 

 
 

Any casual
partners past year            4.7%                   29%