Water, silicone, and oil-based lubes can be found easily at any drugstore, but they all can mess with your sperm .
In fact, one study found that most lubes—including Astroglide and KY products—can significantly affect your sperm’s motility, their ability to swim and move through the vagina.
“When sperm is trying to survive, they need the right environment,” says Brian Steixner, M.D., medical director of the Institute for Men’s Health at the Jersey Urology Group.
As a result, many lubes can actually prevent your sperm from traveling far enough into the vagina to fertilize an egg, he says. Plus, while the natural lubricant of the vagina is obviously never spermicidal, a lot of OTC lubes have chemicals in them that can actually kill sperm.
But even if you’re trying for a baby, that doesn’t mean you should avoid lube altogether. Instead, stick to fertility-friendly lubes like Pre-Seed, baby oil, or canola oil, which weren’t found to negatively affect your sperm.