According to Osho, sex can be animalistic, because man is also animal, but it need not remain so. Human freedom makes sex a raw possibility: it can degrade into mere instinct or evolve into love, prayer, even samadhi. Recognize your animality, bring awareness and heart into sex, and it becomes a bridge to the ultimate rather than a fall.
Sex is just an energy—if you add awareness and love, it can lift you up instead of pull you down.