Finsexual is the exclusive attraction to those who are feminine in nature (FIN). This means finsexual people are attracted to women, feminine aligned and/or feminine presenting non-binary people, and potentially feminine men. Finsexual is not synonymous with the attraction to people who identify as female, it is the attraction to femininity.
A finsexual person might be attracted to a man or a non-binary person who presents femininely. A finsexual person may or may not be attracted to women who present masculinely or androgynous. The exact limits of what is "feminine in nature" can be decided by the user. The term was made with non-binary people in mind but binary people can use it.
The masculine equivalent in minsexual. The non-binary equivalent is ninsexual.