"Sadly, what many couples discover is that lust doesn't stop prodding them after they've "gone all the way." There is no such thing as "all the way" with lust. Ultimately, lust doesn't want sex. It wants the forbidden, and it's willing to take you deeper and deeper into perversion if you'll indulge its latest request." - Joshua Harris

Read more about this interesting subject on the "Definition of Worldly View" page.