Our house has two bathrooms, yes, so it just evolved that one is hers and one is mine.You have individual bathrooms?
Our bathrooms are very unassuming, though, compared to virtually every other "average" house we've been in. Sometime in the last 30 years, it seems that housing trends changed to incorporate a "master bath," which is usually the size of a dining room, subdivided with the toilet in a little tiny inner room on its own, and a giant jacuzzi-style tub that you have to climb three steps to get into.
Ours are the standard vanity with mirror, toilet, and plastic tub/shower kit, vinyl flooring, no window. They're identical.