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

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.