first off .. one would probably think...DRUGS. it is never the wa to go unless you use them. i am NOT encouraging you to use certain drugs to have a longer sexual activity. but some people would take ecstacy. there's three kinds: speed based, herion based, and acid based. i wouldn't do Herion based because 90% of the people i know has or have gotten terribly sick. but it is not how long you keep you and your partners activity going. it's about if you love one another and that's all that should count.
DONT DO DRUGS!!!!