What is at stake here is precisely the problem of the fulfillment of desire:

What is at stake here is precisely the problem of the fulfillment of desire: when we encounter in reality an object which has all the properties of the fantasized object of desire, we are nevertheless necessarily somewhat disappointed; we experience a certain this is not it; it becomes evident that the finally found real object is not the reference of desire even though it possesses all the required properties.

Slavoj Zizek, The Sublime Object of Ideology