Amazing, your view on nudity is very much the complete opposite to IncognitoGuy's views. However, TOS says that P0rnography is not allowed...
imgflip.com/terms
Imgflip is not a pornographic website
The Imgflip generators can be used for anything that does not violate these terms, but please set any pornographic images you create as "private", and then post them elsewhere if you wish to share. Any pornographic images that are not created with the "private" setting are subject to removal.