Thanks for your replies, Advina and KD, you pretty much expressed my consternation.
So, I asked H if he was wanting help with finding a discussion forum and he said yes. I suggested that he could check out askmen (figuring he would feel comfortable with that, he said he had been there, didn't know they had a board) and the Willard Harley site. I had to show him how to maneuver the site, pick a forum, submit a post, etc. so he really is clueless about it. He said he was just going to read for a while, which is probably a good idea.
I didn't offer this site just yet. I'm going to see if he's really the type to use a message board before I decide if I'm willing to give up mine. I have a feeling he'll do it for a few days and then throw it out, not being willing to invest the time. I'll give him the benefit of the doubt though and wait and see.
Now I'm struggling with whether my knowing what he posts would be good or not. I don't visit either of those sites, so I won't stumble across his posts but I am curious. That's part of why I had wanted him to find his own site without my help, and why I didn't want both of us on the DB site. I didn't want to be tempted. I like my privacy (vs. secrecy,) he should have his.