Le camarade de classe de ma femme n’est timide que s’il n’est pas dans notre lit

My wife always took this college classmate home and I always had the greatest trust in her with him, precisely because her classmate seemed to be super shy and completely polite, but on the street I started to hear other comments about him, saying just the opposite, that he was a born eater and that on top of that he was not shy at all, that it was all just to keep up appearances.