Dear Jeyamohan,
I am a Hindu from North India. Last month, I visited Azakarsolai, near Madurai, with a foreign friend. We noticed the porn sculptures on the temple tower. My friend told me that the sculptures might have some connection to occultist practices, but they made me feel embarrassed. I can’t explain them. While browsing the internet, I came across this post and was immediately satisfied by your insightful and historical explanation.
Subhash Joshi