Mr. Prolong has been around so long, it almost deserves a spot in the adult hall of fame. However, this is a new formulation of the old stand-by. As the name suggests, Mr. Prolong is designed to fight premature ejaculation. It's essentially a very mild topical anesthetic which you apply to the head of the penis. The cream tends to last a bit longer, but the spray works faster. In either case, a small application of Mr. Prolong should keep you going all night long.