This newspaper article includes
"The party's culture spokesman, Don Foster, said that it was inconsistent to allow 16-year-olds to have children, and be treated as adults in other respects, but to bar them from watching or taking part in explicit material - which they could access, anyway, from the internet."
However, the MN thread has an extract from a Working Party which puts it into context.
While I can see your concern, it does seem pretty pathetic that a daughter could get married on her 16th birthday and could have her own baby by 17 but is not allowed to see an "18" certificate film.
Somehow I doubt Don Foster would encourage any 16yo to appear in a porn film, and that quote doesn't exactly look more than acknowledging it would be legal, rather than actually suggesting it would be a good thing.
With just an e-mail address, and no credit or debit card, one can currently find hard core porn today this minute, and back in the late 90s it wasn't much different - teenagers were swapping porn clips without their parents even knowing what was going on as the parents were not sufficiently clued up, so it's a bit hard to turn the clock back...
Anyway, it was just over 6 years old, so I suppose Don Foster is just the target of your local alternative parties, trying to grab whatever they can to tilt opinion.
Has Don Foster worked well for Bath ? Rather than call him a disgusting pervert (which might be legally challenged!), it might be better to contact him by e-mail and ask if it is still his view...