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Mithrandir is correct in saying that AgendaX is not an official module. Official modules are those that come bundled with the full download of the XOOPS package. AgendaX is a 3rd party Module and is not considered part of the core of XOOPS.
AgendaX has instructions on how to change the images used, or at least offers a way to selct your own images. It's been a long time since I used the module, so you will have to check the documentation yourself because I don't remember much of it any more. You do not have to use the bundled images included with the module. Considering the images pornographic in nature is subjective. I remember no such offending imagery, although my view is also subjective.
Either remove the offending script,(if one exists) or contact the module developer. You could alter the code to display no images at all. The source is open and you can change it how you choose. Since all module source is shared in an open community, it's the community at large that will change it to their needs or contact the developer if larger problems persists. Another option is to not use the module and find an alternative. It's about choice.
XOOPS.org can not be held responsible for the content, code or misuse of any 3rd party module nor does XOOPS endorse questionable scripts contained within any 3rd party module.