http://www.niapublications.org/agepages/sexuality.asp
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National Institute on Aging Information Center
People seem to want and need to be close to others. We want to share our thoughts and feelings with others and to touch and be touched. Just being physically near is important, but many of us also want to continue an active, satisfying sex life as we grow older. However, over time most people may find that it takes them longer to become sexually aroused. This is part of the normal aging process.