KY Jelly, or if you don't use a condom, just get your girl really horny and wet, the nature vaginal fluids make you shiver and increase the guys' pleasure level 3times more.
For cars, the manufacturer recommended motor oil.
Astroglide is a good lube and is water based, will not damage toys like a silicon based lube will do.
saliva. Motor oil (not seriously)your mom works pretty good, or atleast she did last night
Bengay™ and lemon juice. Any kind of moisturizer.
any lube would work but the best lube to use is organic extra virgin olive oil it is heavenly