These are traits formed because of a higher level of testosterones in the womb during birth. Having these traits does not mean someone is a lesbian, she must also be attracted to women. This is just a very common type of lesbian. Equally, not having these traits does not mean you are not gay.
Red blooded Lesbian - "You should see my penis"
Friend - "Woah your hands are tiny!"
Lesbian - "So are yours"
Friend - "Ya, but your a Dyke"
Lesbian - "But Im not a red blooded dyke, duh!"