I totally agree with you as far as the question of taking reference from pus_sy for tying sari goes.
With regard to body display, I would suggest to take enough care,especially when you have young kids around.
My two bhabi' s wear saree very low and there are countless instances when their pus_sies had opened up. Once, just few weeks before my marriage my younger bhabi (she was recently married and very young of 19 yrs then),was preparing breakfast for me in the morning. She had just come from sleep and her saree was seriously low and somewhat loose. She wanted to pick up a container from upper shelf and so she stood on a small stool and stretched herself upwards on her toes. I was standing in the kitchen chatting with her and I knew that luck had a sweet gift for me. Just then one kid of my elder brother ran in and pulled her by sari asking for some candies. The saree slid down and opened her pus_sy. Such young, fully shaven, white and smooth thing it was. I was totally distracted with high heart beat, but I recalled in mind of my \" to be wife\" and controlled myself.