How does an app show up without typing in a password for iTunes?

Is there a way that an an app can install or be downloaded without knowledge or approval?  Wifi? Bump? Accidental from Facebook? 
The particular app in question provides quotes, photos, and cartoons that can be used on Facebook, backgrounds, etc. It also has a statement that the user must be 17 or older  to download, due to content. 
App does not show up in purchase history. Why not? How can this be?
How does an app install without signing in with a password or tapping the install button?  Possible or not? Need legitimate and plausible response please.

Found a photo offered by the same app on a "friends"  Facebook site. By clicking that photo that had been uploaded by way of their mobile app to their facebook you are sent to a Facebook style slide show  that you scroll through additional photos/quotes from the site.  Is this considered a web app?  It views like any photo slide show on Facebook. 
However it seems that at some point this app actually installed itself on the iPad.  How to prevent in future???

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