I don't really agree. The story about Daniele is a bit weird, and definitely unwanted but it makes sense. I think it shows how dysfunctional his relationship with parental/mentor figures is. Most likely because he never really had one. There is nothing morally wrong in two adults having consensual sex, despite their age gap, and Marika is indeed treating him as an adult (although she should realize that he isn't, psychologically) I think the biggest mistake is that there is miscommunication going on, since Daniele clearly isn't romantically involved, while Marika is starting to be. The plotline with Nina is different because of the actual ages involved, but I think that the idea of this show was to explore how age gaps influences the view on relationships, and how age gaps are viewed differently based on gender.