I beg to differ. The definition of normal is highly subjective. Mormons will think of you as being abnormal.
What one considers as perversion is just not an ordinary thinking for that society, religion, philosophy, etc. It may fit very well within another society or a culture.
Islam recommends early marriages while many of the current cultures look down upon it. A Muslim may think of it as other cultures promoting premarital sex while other cultures may see Islam as condoning child marriages. Difficult to say who is perverted?
In the past, incest was ordinary thing in many cultures. It is not now. How do you see perversion in that scenario? How can things change for being normal to being perverse?