If you're looking to conceive, then Preseed or pure (and preferably pasteurized) egg whites are the only things that I'm aware of that you can use that won't kill off sperm.
If you're not looking to conceive, then there's a product called Sensua Organics and their lubricants contain:
USDA certified organic aloe vera, certified de-ionized water, USDA certified organic grapefruit seed extract, vitamin E, and wildcrafted certified pesticide-free guar gum. Peach and Raspberry formulas also include USDA certified organic fruit flavors/fragrances. (Patent Pending)
I don't know if it's the vitamin E or the aloe that is the main lubricant, but that might be a starting point for you in researching the subject.