Do I need 18 U.S.C. 2257 on my adult oriented website?

Hello, I'm creating a new website that is geared towards adult humor such as jokes, art, videos etc... I've looked over the 18 U.S.C. 2257 but I do not know if I need it, or what type of disclaimer I should post on my website. Almost all media will be drawn, but I will have pictures of nudity (sometimes sex) from other websites that are already 18 U.S.C. compliant. Do I also need some type of disclaimer even though I'm not hiring models or creating any new photos/vids with them? A good example is I might take a sex scene with two models from another site, and remove one of the models and replace them with a cartoon (as a parody type image). Since it still shows a nude model, do I need to have a general disclaimer or am I good to go because their records are being kept by the website that took the photos? I thank you in advance for you answers. Thank you, Neil