The sex researchersWilliam Howell Masters (1915-2001) and Virginia Eshelman Johnson (1925- ) conducted laboratory observations of and experiments into human sexual behavior during the 1950s and 1960s.
Their most famous publications were Human Sexual Response and Human Sexual Inadequacy.
... with 17.4% under the age of 18, 3.5% from 18 to 24, 22.3% from 25 to 44, 28.7% from 45 to 64, and 28.1% who are 65 years of age or older. The median age is 50 years. For ...