@anon154351-- As long as you use a jelly lubricant that has been made for use in intercourse, it will not be harmful to you. But beware of gel lubricants made for general use because they are not suitable for use on the private parts.
Some people use petroleum jelly for example, and that is not safe. It's not water based, it's made of petrolatum. Not only will it be messy, but since it doesn't wash off easily, it can cause a vaginal infection for you. Not to mention that it will make holes in the condom if you use one.
I agree with the article that the best option is water-based lubricants made specifically for use in intercourse. I use these due to chronic vaginal dryness. It has eliminated the pain I used to experience during sex.