Orgasm is important for the man because, duh, how else are we gonna fertalize those eggs.
But the sweet, sweet fact is: it's improtant for a woman to orgasm too! Why? Because when a woman has an orgasm, her uterus contracts and "sucks up" the semen as it is released. Woot! This is still only a theory in the medical field... but I won't tell my husband if you don't.