Saliva is NOT lube. It might seem convenient, but it dries up quickly, increases friction, and can actually make things more uncomfortable. Plus, it can carry bacteria and infections that you don't When trying to conceive, choosing the right lubricant matters. Some common products like oil based lubricants, petroleum jelly, saliva, and regular lubricants may harm sperm and reduce fertility chances. Instead, opt for fertility friendly, Pre Seed Fertility Lubricant Sperm Friendly Lube First Response Fertility Lube Sperm Friendly Personal Lubricant for Couples plusOne Understanding the Risks of Using Saliva as Lubricant Does Saliva Kill Sperm: Trying to Get Pregnant