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I'm looking for a good, cheap, and safe lubricant. Which type is the best and what is the best product?
When in doubt, water water water.
It is the most economical of all the lubricants, as well as the most universal. Granted, you'll need to reapply from time to time, as water-based lubes tend to get tacky.
Silicone toys are becoming more and more common, and they are designed for water-based lubes only.
Once you're ready to explore, you can step up to a silicone lube. Personally I use silicone more than anything else (great for anal, as well as shower play) but water is still a good-ol' standby.