Passionate People (2002)

Tired of waiting for the man of her dreams to start a family, Uma decides to instead raise a child by herself, so she looks for a sperm donor. She ultimately decides that Nico, the boyfriend of her best friend Lucía, is the perfect candidate. So she asks Lucía for a favor: to lend her boyfriend for only one time. In the midst of surprising situations, Uma convinces Lucía and then Lucía convinces Nico. In this way, what starts out as a "simple procedure" ends up transforming the lives of everyone involved.