Apparentely in Canada, no person under 18 may appear in a hardcore porn movie AT ALL, regardless if they perform a sexual act or not.
Assuming you aren't a pedophile, why would you want a minor to be in a porno at all, sex act or not?
In addition, no character may be portrayed as being under 18, regardless of the actual age of the actor, and if they perform a sexual act or not.
Again, why would you want even a 'faux' minor to be in the porno?
(I'm using the impersonal 'you' here.)
Obviously, Joe Republic, one need not be a 'pedophile' to enjoy seeing a 'minor' having sex in a porno film. After all, anyone under 18 is considered a minor, and to be a pedophile one would have to enjoy fantasizing about sex with children. Clearly a teenager in the 14-15-15-17 year old range is not a 'child' in any physical or sexual way, hence they are valid and fruitful subjects for sexual fantasy for the very same men who fantasize about 19 and 20 year olds.
Quite simply there is no significant difference from the film viewer's perspective, JR, and I'd certainly like to see more.