This website is perhaps the first to have each file labled
with its most appropriate Library of Congress Subject Heading.
The title line (at the very top of your screen)
gives the LC Subject for the file you are reading.
This practice began in the middle of 1999.
Eventually the Internet may be organized according to these subjects.
Search engines could automatically organize websites
if they use these standard subjects in the title line.
This principle is explained more fully here:
Library of Congress Subjects .
There are over 200,000 Subject Headings used by the Library of Congress.
The most important Subjects for this Museum are listed here: 

LOVE (Philosophy)
LOVE (Psychology)
EMOTIONS (Philosophy)
EMOTIONS (Psychology)
JEALOUSY (Psychology)
MASCULINITY (Psychology)
FEMININITY (Psychology)
SEX (Psychology)
SEXOLOGY
SEX DIFFERENCES (Psychology)
MARRIAGE
EXISTENTIALISM
AUTHENTICITY (Philosophy)
AUTONOMY (Psychology)
SELF-ACTUALIZATION (Psychology)
UNITARIAN UNIVERSALIST CHURCHES
HUMANISM, RELIGIOUS
SPIRITUALITY
MEDICAL ETHICS
DEATH
RIGHT TO DIE
ASSISTED SUICIDE.

Other key words for internet searches
(which are not Library of Congress subjects):
living wills
Existential Books
gender
voluntary death
merciful death