Let's Talk Annotations

Observations record individuals, and thus annotations describe the individual being recorded. So for dioecious plants, annotating an individual plant as male or female adds value. Monoecious and dioecious describe a taxon. Annotating an individual plant as monoecious or dioecious is redundant.

Again, iNat observations record individual organisms. Just add the Copulating Observation Field or a similar one to an observation showing a mating pair.

Do you have examples of this still appearing as an option for viruses and bacteria?

Those are so rare that I think you can easily address them with Observation Fields (eg https://www.inaturalist.org/observation_fields/14486) or add them to projects like Amazing Aberrants.