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In the Buddha's first discourse, he identifies craving as the cause of suffering. He then identifies three objects of craving: the craving for existence; the craving for non-existence and the craving for sense pleasures. Kama is identified as one of five hindrances to the attainment of jhana according to the Buddha's teaching. Throughout the Sutta Pitaka the Buddha often compares sexual pleasure to arrows or darts. So in the Kama Sutta from the Sutta Nipata the Buddha explains that craving sexual pleasure is a cause of suffering.
If one, longing for sensual pleasure, achieves it, yes, he's enraptured at heart. The mortal gets what he wants. But if for that person — longing, desiring — the pleasures diminish, he's shattered, as if shot with an arrow.
The Buddha then goes on to say:
So one, always mindful, should avoid sensual desires. Letting them go, he will cross over the flood like one who, having bailed out the boat, has reached the far shore.