Hi, this is called as premature ejaculation and is very common problem. Tips for your partners satisfaction- stimulate her clitoris for longer time so she can get multiple orgasms before penetration. Tips for you- visit sexologists in your area and learn Masters and Johnson's technique and Keigels exercises. You can use pill's like clomipramine and paroxetine only after consulting a sexologist. Other wise you can use over the counter products like lignocain spray and Jelly. Also few condoms come with anaesthetic jelly cover like Duralast condoms.