There used to be a product called 'averogel', not sure of spelling, created/sold by a sex institute in San Francisco. I think Susan Block was somehow involved with it.
Anyway, the product was supposed to prevent STD infection, particularly HIV, as it was a chemoprophylactic with nonoxynol 14, I think, and touted as a liquid condom. It was available from the early 1990s on. That's the only one I am aware of being available for purchase.