Unisex is an adjective indicating something is not sex-specific, i.e. is suitable for any type of sex.
The combining prefix uni- is from Latin unus, meaning one or single.
However, 'unisex' seems to have been influenced by words such as united and universal, in which uni- takes the related sense shared.
[3] Hair stylists and beauty salons that serve both men and women are often referred to as unisex.
The sharing of a pool or recreational facility by swimmers and others of various sexes is commonly referred to as mixed bathing.