I think the forum's address/database has been hacked.
I use unique email addresses for absolutely everything (a years long battle against spam... which I won!) and I've just received a malware email to my xway forum email address, so it can only have come from this group. According to the malware, I've been visiting porn sites. Well... doesn't everyone?
Not a problem for me, as I can change my email in 30secs and never hear from 'Herbert' again.