Author here. I certainly don't not track it!

If you're wondering where it could appear in the charts, any one of the Sleep/People/Exercise/Other categories would seem a possible candidate...

It would create a lot of awkward interactions for any of their ex's who see the data after it's published, or their family.

Easier to avoid it at least in the public copy. Though I'd argue even tracking it personally might cause issues if your new SO saw it and started to compare to past partners. Best to just leave it out entirely.

They also don't mention time spent pooping and peeing. Doesn't mean it's taboo. Might just not be useful information to track, unless you're trying to have children or to check how your sex life was affected after already having children.

Maybe because of some of the following?:

- it's embarrassing to talk about your sex life, and maybe especially gaps in it, online? - it's naturally private and people value their privacy, particularly online? - people are so taboo about it that they don't even want to record it for their future self? - it just gets lumped in with "sleep"? - it doesn't take up a significant enough amount of time?

All of these depend on the person, of course.

perhaps it's not an omission..

If the OP did have sex during this time, I expect it is filled under "people". It would be interesting to track, though. In particular, how much life is dedicated to the pursuit of sex vs actually having sex. I know that my time spent actually having sex has decreased from probably an hour per day to an hour per week. Not sure about time spent in pursuit of sex, though.

I want to track sex. So far it's been a spreadsheet.

Is there anyone else with a better method?

I guess it's the Christian problem -- they seem to hate sex, or at least talking about it.