It looks like spammers have hit on the technique of putting articles about whatever they're trying to flog into Wikipedia and then sending out spam citing that as an authoritative source, in the hope that at least one person gullible enough to buy from spammers is impressed. Quoting from a recently caught spam:
The only effective nonsurgical method to lengthen the
penis is by employing devices that pull at the glans of
the penis for extended periods of time. This is known
as traction; where tissues under continuous tension will
undergoe cellular multiplication. The result is tissue
expansion, resulting in a permanent increase of the
tissue...
Source : Wikipedia