I don't understand the text at all but I get the point by following the pictures. Is it really necessary for men to use drugs to seduce the woman he wants. His impotence is not found in his hard-on but in his thinking because he had to resort to this in order to have sex with her.
@57welder: lol yeah, especially considering the fact Reby obviously would have wanted him in a normal scenario.
EDIT: Ah, looking at the English translation, Rock and Reby have already had sex before; she apparently seduced him at one point. However, she refuses to have sex with him when he wants to, so his frustration built up and he decided to rape her in her sleep. Still a loser, though.