1) Introduction to the area (sexual activity as a health resource in older age) -- 2) Levels and trends of sexual activity in older adults -- 3) Sexual activity and physical health benefits in older adults -- 4) Sexual activity and mental health benefits in older adults -- 5) Sexual activity and psychosocial benefits in older adults -- 6) Sexual orientation, sexual activity, and health in older adults -- 7) Risky sexual activity and its impact on mental and physical health in older adults -- 8) Lifelong sexual practice and its influence on health in later life -- 9) Medication to enhance sexual activity in older adults -- 10) Barriers to sexual activity in older adults -- 11) Facilitators to sexual activity in older adults -- 12) How to promote sexual activity in older adults? -- 13) Future directions for research and practice in sexual health for older adults -- 14) Concluding summary -- 15) Glossary.