What is "sunbath"

Usage examples of "sunbath".

And as Steve looked up at her apartment now, his mind's eye was full of Ber-nice taking a sunbath on the roof of the building, with her boobs spilling out of her bathing suit.

And as Steve looked up at her apartment now, his mind’s eye was full of Ber­nice taking a sunbath on the roof of the building, with her boobs spilling out of her bathing suit.

The sunbaths on the roof, which Forry Brown had insisted upon, had wiped away the pallor.