Does lubricant work in helping you to keep on going and having multiple ?

When i have with my partner i only have one and then i get weak and numb and cannot keep on going. I hate it because im having a wonderful time but once i have my i am done. Its funny because i have to tell my boyfriend to take a break sometimes to prevent me from ming. I wish i couldnt get numb and keep going like he does. I was considering buying lubricant but im not sure if it is good as ive seen in commercials.