Asking for verification of who you are should not make you think scam, in fact it should do the complete opposite. I have been a member at xvideos for almost 10 years now I think and in that time I can't say I've ever got any junk mail that could be attributed to having given my email address to the site. That there is a big plus in my books. Also it is not a part of the MindGeek hypocrisy which gets another plus mark from me.
I just checked, verification isn't even required for membership but it does get you:
Your profile will appear at the top of the profiles index for a while. You can have a clickable link in your profile. A small icon will be added so that other users know that your photo is real. Generally, more trust from other users.