Definition: A lesbian is a woman who feel romantically and sexually atracted only to other women. Women who feel atracted either to other women or men are called bisexual. The personal character of each individual may not correspond with its actual behaviour and it could be expressed with either one, both or neither of this terms.
The sexual activity between horny lesbians is so diverse as sex between man and woman or gay sex. Nevertheless, some women who maintain sexual intercourse with other women do not consider themselves as lesbians but bisexual.
Like any other activity, lesbian sexual expression depends on the context of the relationship. Recent changes of Western and some other societies have allowed to lesbians to express themselves more freely, so new studies about female sexuality have been started. There's an increasing number of this kind of investigations, so a new debate about women being able to control their sexuality, redefinition of female sexuality and the disbelief of negative sexual topics has aroused.