Bathtub

A bathtub is a kind of object that appears in most of The Sims games. The primary use is improving a Sims hygiene, as well as other traits or moods.

Some bathtubs have shower fixtures, but most do not.

The Sims
Bathtubs in The Sims (and expansions) also provide Comfort.

The Sims 2
Bathtubs in The Sims 2 (and expansions) also provide Comfort.

The Sims 3
Bathtubs in The Sims 3 (and expansions) also provide stress relief.

The Sims Medieval
In The Sims Medieval, bathtubs provide a positive buff.