From Laumann et al. (1994)

% reporting “always have orgasm during
             masturbation”

             Women             Men
Total
sample       61.2%             81.5%

age 18-24    50.8%             73.2%

age 45-49    70.6%             88.2%

frequency:
6 per year   67%               80%
or less
> twice      83%               94%
per month

       % reporting “always have orgasm during
                     sex with partner”

             Women             Men
Total
sample       28.6%             75%

age 18-24    21.5%             70.2%

age 45-49    34.3%             81.0%
 

% reporting “partner always has orgasm
             during sex”
 
             Women              Men

             79.7%             43.5%