A Defence of Robert
In my opinion Robert gets way to harshly judged. So let's go over some points.
boring: Lena really only talks to him on their 2. date. She is bored because he is 'mundane' and 'irrelevant'. Then she asks him about her job, which he doesn't know yet. She asks him about his love live, which he is not comfortable talking about and she asks him about his passion. Well, he doesn't have one. So what, not everyone is an (unsuccessful) artist burning with a deep passion. Lena btw when asked the same can answer 'writing songs', 'modelling', 'making money' or 'enjoying life' which is actually the same he says.
bad lover: So he can't get Lena to cum. But isn't that at least as much because of her not being ready than him being clumsy? Also I can't remember anyone badmouthing Cherry or Allison, both of which can't get Ian to cum, either. The second time, Lena cums (as long as she doesn't worry too much about being late) so he can't be all bad.
creepy: So he wants to fuck Lena. Anyone here wants to throw the first stone? And you barely even know her. He sees her every day, her ready smile, her sinew neck slowly turning, lightly tilting, her hair shimmering in the ambient light. Her slender arm stretching out, bending forward, her tight pants stretching, her breasts sliding slowly against the velvet of her blou... Err, where was I?
Ahh yes, He is not interested in a relationship beyond sex. So what, so isn't she. He is her rebound guy after Axel. She is using him as much as he is using her.
Without Robert Lena wouldn't had sex yet. Thanks to him we got some really awesome scenes. For this alone I salute him.
Will I drop him like a trice used tissue the moment he gets in the way of anything else? Of course! But I will not hate him.
Addendum:
A (short) Explanation of Arthur
He is so delightfully perverse, he is the most refined, the most sublime of her possible perversions. While most other paths are all about how many huge dicks Ashley can shove in her orifices, he is about cheating on her boyfriend with his father, or tricking Iris into having sex with him.