I heard a dissertation on the old testament verses the new testament related to pornography the other day. Apparently Jesus was born of the lines of King David, Solomon, and others...all who were very sexually driven. Where did the guilt of sex start and now rendered leaves very religious people to proclaim hate against gays and the enjoyment of sex other than for procreation?
I'm not going to answer this, I'm going to give you feedback on why your question probably won't receive a good answer from anyone on this subreddit.
There are two main problems, one is that your question seems ideologically loaded, the second is that you are asking about 5 very broad questions: