Saliva is not good. Here are a couple of resources:
A 1998 study in the medical journal Human Reproduction examined the effect of KY jelly, baby oil, olive oil and saliva on sperm motility (movement) along with other semen characteristics. Each of the tested lubricants had serious effects on sperm, the most toxic of which was saliva.
The least detrimental of those tested was baby oil. The authors concluded, “we would recommend that couples - especially those having difficulty in conceiving - should be aware of the detrimental effects of such lubricants and avoid their use.” http://fertilefacts.wordpress.com/20...liva-on-sperm/
Couples trying to conceive who want lubrication during intercourse are best advised to go to their refrigerator rather than their medicine cabinet. Vegetable oil, and olive oil don't have too much of an impact on sperm survival and petroleum jelly is also a relatively safe alternative. However, lubricants such as K-Y Jelly, Sugilube, Alpha Keri & Keri Lotion contain bacteriostatic agents, which can significantly decrease sperm motility. Saliva contrary to popular belief, is also toxic to sperm.
The best option is to use nothing. http://www.havingbabies.com/infertil...ronmental.html