All relevant surveys have shown men and women still having sexual intercourse when in their
eighties or even
nineties, though around three-quarters of all men are impotent by the time they reach their
eighties. The oldest
potent male in the Kinsey survey was an 88-year-old Negro, who continued to enjoy regular
sexual intercourse
with his ninety-year-old wife! It should be said that some cases of impotence in old men are
certainly due to the
absence of adequate stimulation: though it is arguable that sudden stimulation to orgasm in an
old man could
prove fatal as has happened.