I have kept a record for some time, I find it very useful. Memory plays tricks on you otherwise. Thanks to the spreadsheet no matter how horny I get I am reminded that it isn’t all that when you have to pay for it. Also I started to record my phantom STI symptoms. I soon realised it was the same shit every time and it was all in my head.
There are many options to hide this data.
1) Hide it in plain sight “Amazon.xls”. Encode the data somehow. Girls initials only, Reg= Regret, Rec=Recommend. A18 = Jan 2018 etc. put it in the middle of a sea of pointless data. Like hiding a tree in a forest. No text descriptions.
2) Use encrypted password protected USB drives. Note any pics or files you open appear as thumbnails in “Recent Files” on Windows File Explorer. Also it’s now a crime not to provide encryption keys when asked by police.
3) Download encryption software, such as BitLocker. All PC users can see you have BitLocker so you need a good story and a dummy file with Bank details, passwords or private stuff you can show to your mum if challenged.