Lesbian community

A few months ago I received an email from a woman who was upset, over a conversation that happened with a few of her friends. One of her acquaintance's thought that a woman could not call herself a lesbian if she had not being sexually active with another woman. True, that the primary use for the word lesbian is to describe a woman sexually attracted to another woman; however, there is no indication in that same definition that you must have been sexually active with another woman to be identified as a lesbian.