What is lube? Personal lubricant is used during sexual activity to decrease friction but it comes in several formulations. The primary benefits of using lube include: It improves condom barrier safety by preventing Four things you should never ever use as lubricants during coitus 1. Vaseline Petroleum jelly It traps bacteria, increases risk of infections (especially yeast & BV), and can damage condoms. 2. Saliva ( Amazon.com: Sasmar Vanilla Flavored Lubricant Water Based Personal Lube for Men, Women Feels Natural, Long Lasting Formula, Paraben Free, Toy Friendly and Condom Safe, Oral Lubricant for Couples 60 ml : Is vaseline a good lubricant for anal sex? Using baby oil as a sexual lubricant: Is it safe? Using Vaseline As Lubricant Adam's Toy Box