Lubricant compositions and methods are disclosed for aiding and enhancing massage or sexual activity, treating and preventing sexually transmitted diseases, and preventing pregnancy by administering a colloidal metal containing composition. Colloidal metal containing compositions that include metal flakes, sperm-function inhibitors, antimicrobial agents, analgesics, plant extracts, anti-oxidizing agents, and anti-inflammatory agents are also provided and may advantageously be used to in the methods of the invention.