No, for real people being 18 years old is the only requirement. (Unless some companies/countries have different rules but it would not be against law)
It seems your right. My moral compass find it at least intresting, that if you produce (legal) porn only with the intent to simulate illegal porn, that this dosn't have some restrictions... But find nothing, that legaly, support my world view.
Other than, and with the same search, it looks that simulated ********** is also less illegal than I have thinked:
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For what I see, it looks as this:
- porn is in most countries in Europe and America legal, in most other countries not or only with great limits (without regarding **********)
- ********** in most countries illegal - would supprise me otherwise
- simulated ********** is more allowed than **********
- doesn't find anythings regarding porn with real actress for "simulated" ********** that defines this as illegal
Disclaimer: I do not defend this kind of porn and on no term support it.