I've been using condoms for awhile now and I have found that even lubricated condoms get dry too fast. I was wondering can I use petroleum jelly as a lubricant or my girlfriend's moisturizing body lotion?
Latex condoms are not compatible with oil-based lubricants such as petroleum jelly, vegetable/mineral oil or regular body lotions and moisturizers. These will weaken the latex material and eventually damage the latex condom, creating a situation similar to if you would be using no condom at all. Look for statements on the bottle such as "compatible with latex condoms" or "latex condom compatible".
As you know, however, condoms are not just made of natural rubber latex but also from polyurethane or polyisoprene so alway read the directions for use as different condom materials may allow for different types of lubricants.
Also read: Your Ultimate Guide to Personal Lubricants