It requires the rejection of years of socialization and implies no longer directing oneself towards, or being defined by, men. It means that women fall in love with one another, make love together, achieve orgasm. Lesbianism is the total rejection of patriarchy and male definitions. It is the recognition of the validity of women in all spheres of life. It says that loving another woman is good, healthy, exciting, fulfilling.
Many women are lesbians.
Many women at Mount Holyoke are lesbians. You may share your P.O. box with a lesbian, because lesbians have P.O. boxes. And lesbians skip classes sometimes, and get behind in their work. Lesbians get good grade and bad grades. Lesbians like to dance and have parties.