Well if his wife cheats on him on that trip it's not that big of a deal. On the one hand he can't satisfy his wife because of premature ejaculation, on the other hand he is sexually fantasizing about another women he just met who turned out to live in same building. Judging from his head filled with her, I bet he would cheat with her on his wife on occasion immediately.
His lovely beautiful wife seems really dedicated to him, yet he just thinks about another woman.