Okay is this the first app of its type? I mean I get it, it's more common for women to do this than men (at least that's been my experience) due to its usefulness in tracking the probability of pregnancy or when pregnancy occurred. I know my ex-wife did this back before apps were a thing by making a small marks on calendars that indicate when, what, how etc... so I do get the desire to do it.

My real thing is does this need to be a separate app and separate calendar. We have too many separate things. Instead why doesn't the app at least offer ical integration with your own calendar of choice. This could be a privately hosted calendar this could be a cloud calendar that is not theirs or it could be theirs. The usefulness of an app to have predefined things and buttons is very useful but I want to track all my things on my calendar not 27 different calendars for all 27 different things I want to track in my life.

There are about 10 similar apps in the Apple App Store.

Most have in-app purchases, i.e. "pay for pro"

I didn't see any data portability, so switching apps could be problematic.

Don't many people just make note of their fun times on social media? And upload videos?

Asking for a friend.

People have too much free time. Classic solutionism