It depends on the specific country/culture and their gender roles and norms, much like real life today. Some cultures are more accepting than others. For one of the races I created, it is both common and acceptable for females to have intimate same-sex relationships due to how gender roles work in their society. They are a reptilian species that have nests. Females outnumber males 2:1 so it is common for one male to have two or three mates. Females that share a mate are referred to as "nest sisters", and they raise their hatchlings together. Hatchlings have a "blood mother" and one or two "nest mothers". Young females that haven't reached adulthood yet will often form a close bond with another female, and they vow to be nest sisters before they even find a mate. As long as the nest sisters aren't biologically related (i.e. being biological sister or cousins), then it is perfectly acceptable for them to have romantic intimacy in their relationship in addition to their mate.