From Gagnon (1983)
 
 

Frequency of Intercourse (current)

               Never/rare    Sometimes        Frequent
 
 

Age at
first menses
 

9-11 (early)      30.4%         41.3%            28.3%
 

14-20 (late)      47.2%         33.3%            19.4%
 
 

Orgasm during Intercourse
 

                  None     Rarely/       Often/
                          Sometimes      Always

9-11               9.1%     38.6%         52.3%
 
 

14-20              25%      36.1%         38.4%