People vary a lot in their desire for sex. Some would like it every day or more, some only a few times a year. There is nothing wrong with either, but a relationship between people with different levels of desire is likely to be unhappy.
On the porn issue - while a lot of men do look a porn, most use it as a substitute for sex when their partner is not available (or they don't have one). It sounds like he wants porn instead of sex, and I think that is a problem. (I'm a guy)