Any body else seeing this

Between the heading on first page it has. Had couple of weeks but went away.

Childforumbits

Probably a default label in the vBulletin underlying system used to operate the site.
Think subdirectory label in a hierarchical system.
Perhaps the actual label tag became disassociated.

Just wierd to have on an sex site

In computer parlance, the parent-child relationship is often used as a metaphor for any construct that creates a path from one node to another. In this case sub-forums are probably referred to as child forums of their containing, or parent, forum by the original coders.
No big deal. It's your mind giving it the illicit connotation.

I am in computers, damn completely missed that.

Thanks FoulRon