From Fisher (1978)

                  TIME 1  :  % intending to have intercourse
 

erotophiles                       77%

erotophobes                      43%
 
 

                 Time 2:  % who DID have intercourse

                               Time 1 intention

                       Intended              Unintended
                      (no surprise)          (surprise!)
 

erotophiles              65%                      0%

erotophobes              82%                     17%