Author really need to make a list of the women's profile. Their name, where and when they met each other, faction, etc.
Actually, he did. At least in the web novel.
At the end of every WN chapter, there will be summary about
- his wealth
- how many chicks he had (IT'S OVER 1,000)
- how many kids he had (ALSO OVER 1,000)
- who were with him in peace time / war time
- what some characters doing in the background
- and even some hints to future events
Which I think inspired the Omake page at the end of chapter. I really like how Claudia doing while MC was away and when she received his letter for the first time and foreshadowing the meeting with MC
And every once in a while, you got a very long and detailed character summaries:
- Name, body figure even hair color, including other male characters
- How they met
- How the relationship with MC thus far
- Who he/she familiar with (maybe not told in the main story)
But even characters summaries, he lost count of how many women he slept with midway.