A
Hi, go into settings, then apps, find the app in "downloaded" and uninstall it from there. Or you could load up the play store and remove it that way, however I'm not too sure the Play Store has many "porn" apps. Did you download this from a third party, i.e. an apk file? if so you will be able to delete the file, which should be found in your download folder.
If all else fails do a factory reset (make sure you back up your data first though)
If You Got The Virus The Do A Factory Reset As Fast A You can
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Hi, I think may be this app have acquired 'Device Admin' right to prevent it from uninstalling. If that is the case, Go to Settings>Security>Device Admin> Turn off the app. Now you will be able to uninstall the app.
I go into device admin and click to deactivate the administrator but then my screen locks and when i unlock the screen it shows that the admin is still on