The answer is straightforward, please DO NOT use saliva as a lubricant since saliva contains substances that can significantly reduce sperm motility. Studies done with incubating saliva with sperm show a significant reduction in sperm motility as early 5 mins of contact. Can saliva kill sperm? Yes it can! for sure. saliva can also kill sperm. Saliva as lubricant while trying to conceive is NOT Recommended…Read more