2 ms·I think the STD-reducing liquid you're referring to is a vaccine.by majani 14y agoI think the STD-reducing liquid you're referring to is a vaccine.WA 14y agoThat's one approach. The other would be something like a spermicide but also agains STDs applied locally.eru 14y agoNope. He's talking more about a sperm-, virus- and bacteria-killer.