The other reason season five never made it stateside in the late '90s. The Starlights are three Sailor Senshi from another star system looking for their missing princess. This leads them to Earth, where they disguise themselves as a boy band to hide (always a great way to keep a low profile!). In the manga, they are just pretending to be male, but in the anime, they physically become male. (This is made abundantly clear in their transformation sequences.)
Additionally, their leader is clearly in love with Sailor Moon, a relationship that couldn’t really be altered without changing the plot drastically.
This left the censors in a weird place: make them always female, and you have a lesbian relationship. Make the relationship specific to the male side, and you need to explain the gender bending. Leave it as it is, and never have it shown on network TV. Some countries got really creative, but the US just gave up.