Looking at the web a bit, the statement appears to not be so.
... However, this is very rarely large enough to cause infertility.
While the morph images appear to be a good indicator Webb is the daddy, based on mumps, Clinton just lying as usual.
Could be, but i'm kinda thinking there would be much consequences if he weren't lying. He was apparently a serial predator, and if he were fertile, this would be an unworkable behavior. It would eventually bite him in the @$$.