It seems simple: an egg + sperm = one embryo. But if your sperm is "few, vague and abnormal" and your woman is premenopausal at age 37, things start to get complicated.
| Actor | Role |
|---|---|
 Alexandra JiménezAlina | Alina |
 Paco LeónFran | Fran |
 Elisa MouliaáGloria | Gloria |
 Karra ElejaldeGinecólogo | Ginecólogo |
 Ingrid García JonssonChica 25 Fiesta | Chica 25 Fiesta |
 Ernesto SevillaNot listed | Not listed |
 Eva UgarteChica Emo | Chica Emo |
 Iñaki FontKoldo | Koldo |
 Alberto AmarillaGuillermo | Guillermo |
 Ana LabordetaDoctora | Doctora |
 Goizalde NúñezNot listed | Not listed |
 Eva LlorachNot listed | Not listed |
 Ainhoa AierbeAlma | Alma |
 Belén LópezTeresa | Teresa |
 Guiomar PuertaChica Gafapasta | Chica Gafapasta |
| CCristina PonsMadre Activista | Madre Activista |
 Maribel SalasPsicóloga | Psicóloga |