This might be slightly off the original topic, but...
Apart from the obvious reasons for increased porn usage--accessibility and cultural acceptance, I think part of the problem with pornography within the Church has to do with how the church deals with the sexuality of singles. Which is to say, the church pretty much says, "don't" and leaves it at that.
The "don't" was perhaps more effective 100 years ago when most people were married by the time they were like 22. Now, there is a much larger single population (to the tune of about 30% of the adult population). If churches aren't willing to engage in discipleship with singles regarding their sexuality, how do they propose that people learn how to handle it? Trial and error?....Well, yeah, pretty much.
I've talked to a lot of long-time singles about how their churches deal with some of these issues, and most churches don't. Some might luck into a great singles group, or a spiritual mentorship, but there are few churches that prioritize the internal lives of singles. Most singles are just expected to sort it out as best they can--which leads to a lot of isolation and shame around some of these issues.
Besides that, there are actual skills available to people regarding the building of a principled interior life. And a lot of valuable advice from singles who've "been there." I wish there was more access to this within the church.