Most Helpful Guy
You don't owe him any explanation. That said, I think your inexperience is letting him get away with being a huge creep if you've known him one week and he's demanding you cuddle and kiss him - especially if you've never met in person. You've got a lot to learn if you think that is normal. I have a feeling your friend already told him you have zero experience and he sees an easy target. I would steer clear of this entirely. (FYI I know you are going to do the exact opposite. Don't tell me I didn't tell you so.)
Most Helpful Girl
Should you? Probably!
Do you have to? Meeeh I don't know.
I had my first kiss at 24yo just a month ago. Never have been in a relationship nor have I dated before.
The guy was 23yo and experienced.
I was nervous and almost trembling but I decided to not tell him and I let him go for it.
I know it sounds cliché but I guess you pick up what to do with your lips and tongue fast enough. I followed his lead and we madeout for 20 minutes or so.
I did stop him when he wanted to do more than kiss. I told him I wasn't going to have sex with him yet.
But I guess you could tell him. He won't go at it the same way and he won't start gropping you or initiate something more than a kiss (unless you want more?).