What can be a normal sexual appetite for a man?

Whatever is right: Humankind is diverse, and there are few one-size-fits-all models. Anyone telling you that a man needs to want thus-and-so, thus-and-howsoever-often is wasting your time. The key is the relationship. When two people are in love, it's essential that they do what they can to keep one another happy / satisfied in every respect. And people vary tremendously. That's the challenge -- and beauty.