IPhone set to never accept cookies?

Please help. My husbands phone was set to never accept cookies (iPhone) does this mean that he is up to something online? Does this stop me from seeing his Internet history? Does it mean that he has been on adult sites? Can someone please explain

he said he did not put his phone on this setting

Do cookies make you get pop ups? I ask because he had a pop up from words with friends app the other day from a adult dating site

Cookies are little packets that are stored on the phone that contain information. Clearing cookies will delete any saved passwords on a site. Meaning if you enter a password, click for it to save, then clear cookies, you'll have to re-enter that password.

You can however, still easily check his history because Cookies have nothing to do with History.