Bi-Lesbian is an individual who uses both bi and lesbian labels.^[1]

This term can be used by women and non-binary individuals who use the split attraction model and are bisexual/biromantic/etc. and homo- (lesbian) or an individual who experiences lesbian tertiary attraction. They have one form of attraction to two or more genders but are only attracted to women via another form of attraction. They may find themselves sexually attracted to men, but could never picture themselves in a relationship with one, putting more emphasis on their attraction to women, though this varies from an individual to an individual.

It can also be used by individuals who identify as both bisexual and lesbian, either due to changing attraction (such as abrosexuality), or due being part of a plural system, such as having a different sexuality when fronting, or being in a median system where one member somewhat experiences their headmate(s)' attraction(s).

Additionally, the term can apply to women and other non-men who are bisexual and prioritize their attraction to women/non-men or have a strong preference for women/non-men, or for individuals who are reclaiming the historical definition of lesbian alongside identifying as bisexual.

Other reasons may include:^[2]

• Questioning, being unsure, or being in a "grey-area" between the two
• Being duosexual or otherwise amplusic
• Being mspec, but not being attracted to men, so you still use the "non-men attracted to non-men" definition while still being bi, pan, trixen, etc.
• Attraction to multigender people, causing one to consider their attraction to both lesbian and m-spec simultaneously
• Being in a system with bisexual and lesbian members
• Lesbian who is attracted to nonbinary people who aren't comfortable being included in lesbian attraction, so they fall under the "bi" part instead
• Lesbian who's dating a trans person who came out while they were dating and no longer wants to be included in lesbian attraction, but they're still attracted to them, so they modified their orientation label accordingly to accommodate their partner
• Nonbinary person with lesbian as their gender but isn't necessarily lesbian in orientation
• Being attracted to non lesbian non-binary individuals
• Being primarily or predominantly lesbian (lesbiflexible)
• A lesbian with a lesboy/saphboy partner
• Using lesbian as an umbrella term