必要なのは、2252条(US Code§2252 児童ポルノの所持、配布、受領)じゃなくて、2256条(US Code§2256 児童ポルノの定義)な?
ちな、条文は用語の定義で児童ポルノとは、
(A) Except as provided in subparagraph (B), “sexually explicit conduct” means actual or simulated?
 (i) sexual intercourse, including genital-genital, oral-genital, anal-genital, or oral-anal, whether between persons of the same or opposite sex;
 (ii) bestiality;
 (iii) masturbation;
 (iv) sadistic or masochistic abuse; or
 (v) lascivious exhibition of the genitals or pubic area of any person;
(B) For purposes of subsection 8(B)?[1] of this section, “sexually explicit conduct” means?
 (i) graphic sexual intercourse, including genital-genital, oral-genital, anal-genital, or oral-anal, whether between persons of the same or opposite sex,
   or lascivious simulated sexual intercourse where the genitals, breast, or pubic area of any person is exhibited;
 (ii) graphic or lascivious simulated;
  (I) bestiality;
  (II) masturbation; or
  (III) sadistic or masochistic abuse; or
 (iii) graphic or simulated lascivious exhibition of the genitals or pubic area of any person;
(3) “producing” means producing, directing, manufacturing, issuing, publishing, or advertising;
ってな感じで、胸や性器の露出を含む直接的な行為ね?
 ttps://www.justice.gov/criminal-ceos/child-pornography