Ally — Someone who confronts heterosexism, homophobia, biphobia, transphobia, heterosexual and genderstraight privilege in themselves and others; a concern for the well-being of lesbian, gay, bisexual, trans, and intersex people; and a belief that heterosexism, homophobia, biphobia and transphobia are social justice issues. Asexual — Person who is not sexually attracted to anyone or does not have a sexual orientation. These practices are often misunderstood as abusive, but when practiced in a safe, sane, and consensual manner can be a part of healthy sex life. Many men who do not have one or all of these characteristics define themselves as bears, making the term a very loose one.
It’s #ButchAppreciationDay, and this is what butch means to me
LGBTQ Glossary - Queer Resource Center at The Claremont Colleges
Being butch is about playing with and challenging traditional binary male and female gender roles and expressions. Yet butches have been around, challenging societal understandings of gender roles, across cultures and throughout history. Butch is not just one thing, as most queer cultures across the globe have their own variation of the term specific to their own social context such as location, race and class. She was a 19th century landowner, industrialist and adventurer, whose diaries recorded her relationships with multiple women. She presented in male clothing and occupied male spaces afforded to her by her wealth and social standing.
Butch and femme are terms used in the lesbian subculture  to ascribe or acknowledge a masculine butch or feminine femme identity with its associated traits, behaviors, styles, self-perception, and so on. This concept has been called a "way to organize sexual relationships and gender and sexual identity". Both the expression of individual lesbians of butch and femme identities and the relationship of the lesbian community in general to the notion of butch and femme as an organizing principle for sexual relating varied over the course of the 20th century. The word femme is taken from the French word for woman. The word butch , meaning "masculine", may have been coined by abbreviating the word butcher , as first noted in George Cassidy's nickname, Butch Cassidy.
The old adage applies: You know her when you see her. Butch is an aesthetic, but it also conveys an attitude and energy. Because part of being butch is owning it, the whole aura around it.