However, most lubes are water based and are fine to ingest. I don't know of anything on the market that isnt safe to swallow. If you think about it, if a girl is going to have this stuff in her pussy or ass it would have to be non-toxic.
As for flavoured stuff, its fairly common in sex shops. You can get flavours like banana or strawberry amoung others. I would'nt say the taste is all that different to the regular stuff much of the time. I guess if you buy the expensive flavoured lubes they might taste better.
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