i know astroglide or a waterbased lube is the way to go but i was in the situation where i was, as warlock put it "riding the bus up hershey's highway" and my girlfriend asked if i had any lube so i went to the bathroom and realized i was fresh out but then i saw the tub of petroeum gelly and remembered it is quite the lubricant, but i thought about the condom getting weakend by it, but thankfully trojan lubricates there condoms a good deal so the evening went on without a hitch