给打算怀孕的mm看看，从书上quote来的："Research has shown that KY Jelly, Astroglide, Replens, olive oil, and saliva all interfere with sperm motility. If you need a lubricant, you may want to try baby oil or canola oil, which are reported not to interfere with the sperm; a sexual lubricant called Pre-seed also advertises that it is nontoxic to sperm."