I did something weird but it turned out good

I was walking on the streets of London and I saw a woman in her 40s with a great body, blonde hair and tanned skin. I don't know what came up in my mind. I walked up to that lady and I asked her "excuse me mam? Do you mind if you hit me in the balls with your knee?", with a smirk she kneed me in the balls super hard and walked away. I was very muched turned on by that.