The main thing that will really change your orgasms into 'whole body' experiences is the strengthening of the pelvic floor muscles by means of daily 'kegel' type excercises.

My orgasms used to last for the lenght of my ejaculation,..although orgasm and ejaculation are NOT as connected as many men think,...However, after the pelvic muscles become strong orgasm lasts well after the shots have finished and the sensation is a MUCH deeper one that causes the whole body to climax rather than just the genital area.