As I noted in another comment:
Currently this is explicitly against the law[0]:
(a)In General.—Any person who, in a circumstance described in subsection (d), knowingly produces, distributes, receives, or possesses with intent to distribute, a visual depiction of any kind, including a drawing, cartoon, sculpture, or painting, that—
(1)
(A)depicts a minor engaging in sexually explicit conduct; and
(B)is obscene; or ...
(b)...
(c)Nonrequired Element of Offense.—
It is not a required element of any offense under this section that the minor depicted actually exist.
It is not a required element of any offense under this section that the minor depicted actually exist.