Subscribing to a porn site usually requires an email address. You get email from the site noting that you subscribed, that your subscription was renewed or cancelled or a problem developed with your subscription, and sometimes you get your username and password sent to that email address. No sexual communication of any kind occurs through that email address, if we're talking about a regular porn site.
Adult Friend Finder is a different story. I don't have an account there, but I think that people communicate through email after finding each other on that site.
That said, if it's just movies and such, I don't think that's the main issue. The main issue is whether he's neglecting you. If he is, it doesn't make that much difference what he's neglecting you in favor of. If he's not, then his other interests, whatever they are, are not really interfering with your relationship unless you make them interfere by entering into a power struggle over them.
a fine and enviable madness, this delusion that all questions have answers, and nothing is beyond the reach of a strong left arm.
