I got asked this question on a civvie date. Before the date, I had been working at home throughout the day. I had a few cancellations but still saw four clients for full service, which wasn't too bad.
My date was trying to be coy in how he asked me about my history, and without thinking I blurted out, just four today.
The look on his face was the best part of the evening. I realized a moment later he was thinking a lifetime and I was just thinking I was a little disappointed I had only been with four men before my dinner date.... Time to backpedal
I do keep detailed records with a computer program, and in a notebook during my early days so I know exactly what my body count is, but that's for me to know. I sometimes celebrate career milestones (even 1000, etc) with a gift or holiday for myself.