The Story of a Summer Lover(Povestea unui pierde-vară)

Petru is a math professor at the Polytechnic University, who's living an easy life, with no big worries. He is in an open relationship with Irina, who agreed he can sleep with other women from time to time. But when she becomes pregnant, he will be put in the situation to change his lifestyle and be forced to mature at 42 years old. One of his supporting friends decides to write a book based on his story.