User blog comment:The Reptile King/The Reptile Kingdom/@comment-46325759-20200911061519/@comment-27950421-20200912040719

Well harem situations are the norm in the kingdom. Males are a bit rare due to mamono populations and predators. (Mamomo have an easier time surviving an encounter with a T Rex than humans, so the human population is on the small side.)

If all else fails, all of the above is a valid answer.