Pre Seed Fertility Lubricant Does Not Interfere with Sperm Function Not all lubricants are created equal when it comes to fertility. Most commercial lubes (like K Y Jelly, Astroglide, Replens, Optilube, and even olive oil or saliva) can impair sperm motility or damage You can do everything right track your cycle, plan the timingand still miss what matters in between. Because conception isn't just about when it's also about the environment.Most lubricants are made for Reasons you should be using a fertility lubricant when TTC 1 Regular lubricants can be harmful to sperm 2 Fertility lubricants mimic natural cervical mucus 3 They can help provide comfort