Horny at 'that time of the month'
I'm always at my horniest when I am menstruating and this goes back to my first orgasm at the age of 13/14. Back in the late 1960's the only sanitary towels available were thick belted ones and the feeling of the soft padding against my pussy gave me the most fantastic feelings, although at that stage I didn't realise what they were.
One day when I was having quite a heavy period I wore two pads to make sure I didn't have any accidents. All that bulk in my pants felt awesome so I rubbed myself through the towels. All of a sudden I felt my pussy twitching and the most fantastic feelings ran all the way through me. My first orgasm which I have repeated many times over the years. There is still no feeling which comes up to masturbating in thick pads.