Bromide salts were used as a sedative in the late 19th century but I never noticed any decrease in libido in the hot tub. We used it because it's supposed to be easier on the skin than Chlorine what with being further down the chart and therefore less reactive.

In the gas and pure liquid form Bromine atoms appear in pairs: Br₂, they hang together to share resources (electrons).
When it dissolves in water it splits off into two Br^- ions and gets called Bromide, the 'ide' tells you its on its lonesome and the minus says its now looking to share resources (electrons)