Is it normal to sit where someone else was sitting just to feel their warm butt

I was on the train coming home today and sitting next to me was this beautiful brunette woman and she was wearing a nice summer dress with flip flops and her legs were crossed and she had dark purple toenail polish. Her stop was the one before mine so she got up and I made way for her to leave. There were more stops after mine so just out of courtesy I decided to make some room on the train and sit where she was sitting next to the window, so someone else could get the free seat next to the aisle. But I really wanted to sit where she was sitting and feel how warm her butt was on the seat. To my surprise it was warmer than expected. I found the thought pretty sexy like she was keeping the seat warm for me.