There's no right or wrong way to have an orgasm. Mine aren't typically full body either, I hardly have time these days! But if you want a more sensual full-body experience, is your partner caressing you everywhere? A foot massage is good for opening up your senses. Massage oil used all over will also accentuate sensation throughout your body that will heighten the sensation when you orgasm. Being kissed everywhere can have similar effects. And do you spend lots of time on foreplay? All those things can help increase pleasure throughout.