There are
(a) men who don't use porn and have regular sex with their partners; and
(b) men who DO use porn and have regular sex with their partners.
Likewise with men who don't have regular sex with their partners (c), (d).
I suggest there are very, very few men who actively prefer wanking off (with or without the use of porn) to having sex with their partners. While this may be true over very short periods (ie, the male necessity to "reload") this isn't a long term thing absent some extra reason, such as fatigue, health problems or discord.
I suggest that there are rather more men who use porn because they either aren't getting any sex or because they have a very unsatisfying sex life (caused by, perhaps, fatigue, health problems or marital discord).
I very much doubt that looking at Hustler Magazine stops men from having a sex life any more than Fifty Shades of Gray stops women from having a sex life. For the average man it is fantasy - just as erotic literature is - and not a simple replacement from the commonplace reality of sex with one's beloved.
I do very much believe that a man or woman who has an absolutely crap sex life will look for some sort of fulfilment somewhere else. For men that will, most commonly, be porn. Sorting out the sex life (for all we know the OP might have problems in bed that aren't her husband's fault) will stop the porn use unless we are dealing with man type (a).