I recently came home to find all my computer files were deleted, e.g search history, recent websites. Being a bit of a computer nerd I searched through my computer to find when it was deleted and what was previously veiwed before being cleared.
I found searches for porn and all things discusting. My husbands friend and him thought it was interesting to look at women puuting large objects in places they shouldnt.
I confronted him and asked whats his problem looking at dirty things like that.

I let it slip and now am Im thinking should I be worried???

Let´s look at it the positive way. Now, you know your husband a little bit better.
I think it´s not worth worrying a lot. I don´t think you can ban an adult to do something either. The only thing you can do is to show that you are not happy with it, and later in a friendly way you can ask him more about it, like why he did it.
And for the future, I hope you won´t need to discover more to know more about him!

irishay, I would have to say that if it was a few sick things that him and a friend were having a laugh at that is one thing, but if you suspect that it is more then that you should for sure keep an eye out. Internet porn has become the fastest growing addiction in men, its the "crack" of the internet.

It tends to ruin families and lives of the men who can´t help themselves. If you become aware that its not just occasional and more of a past time, then you would worry.

I completely agree with Karekin. I think this is a bad sign.. Maybe you don´t want to "lecture your husband" just yet, but if I was you, I would find out more about pornography, what kind of stuff is out there that your husband may be watching... and ask yourself, are you really OK with that? Husband watching porn has a very negative effect on most women and on the relationship overall. If you are not ok with him doing it, I think you should not compromise. If this issue becomes very serious, you could seek couple´s counseling.