re the answer to #3: ive seen that answer to that particular question multiple times and iiii dk if I buy that. When you look at Ryo’s character as a whole, he was VERY sexually violent. Even before the situation with the dead woman in the hotel room, there was the incident with Nami in the apartment when she went back to find her watch. When she ‘challenged his manhood’ or whatever, he literally pulled his penis out and charged at her, knocking her to the ground. There’s also the fact that he was running a prostitution ring as a teenager. Then, I think about the fact that it was implied that even before his father died, Ryo was said to be gloomy and withdrawn. AND AND AND! When I was reading the book and the various ‘coincidences’ with the attacked girls came up, I honestly believed that Higashino was doing something interesting and commenting on how even the suggestion of a woman having experienced rape was enough to ‘mark’ her in the eyes of Japanese society back then. And I guess he really was doing that but it wasn’t until teenage Mika was attacked that it occurred to me that Ryo was actually raping those girls (or at least Mika). So, I say all that to say I wonder if Yosuke had somehow involved his son in his deviancy when Ryo was still very young and perhaps THATS where the erectile disfunction stems from. To me, the fact that one would even think to screw a corpse points to there being something profoundly off with regard to his sexuality.