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Do you think you might have HPPD?
Take this survey out of University of East London,
which attempts to understand the inner experiences of
people with lasting perceptual changes from use of
psychoactive drugs, (diagnosed or not). It investigates
factors that could create distress or effect quality of life.
References & Related Books
by Erowid

Aphrodisiacs: From Legend to Proscription
Walton, A.H. Associated Booksellers, 1958.

Better Sex Through Chemistry: A Guide to the New Prosexual Drugs
Morganthaler, John and Dan Joy. Smart Publications, 1995.

Botanica Erotica: Arousing Body, Mind and Spirit
DeLuca, Diane. Healing Arts Press, 1998.

Cannabis Spirituality
Gaskin, Stephen. High Times Books, 1996.

The Encyclopedia of Sacred Sexuality: From Aphrodisiacs and Ecstasy to Yoni Worship and Zap-lam Yoga
Camphausen, Rufus C., Inner Traditions, 1999.

The Magical and Ritual Use of Aphrodisiacs
Miller, Robert A. Miller Destiny Books, 1992.

Plants of Love: The History of Aphrodisiacs and a Guide to Their Identification & Use
Raetsch, Christian (Ed.). Ten Speed Press, 1998.

Scrapbook of a Haight Ashbury Pilgrim: Spirit, Sacrament, and Sex 1967-68
Gips, Elizabeth. Changes Press, 1991.

Sex & Drugs: A Journey Beyond Limits
Wilson, Robert A. New Falcon Publications, 1983.

Virus: The Alien Strain
Brown, David J., New Falcon Publications, 2000.

Flashback Books Sex & Drugs / Drug Erotica list

Sex and Spirit: Ecstasy and Transcendence, Ritual and Taboo, The Undivided Self by Clifford Bishop
The Illustrated Kama Sutra (trans) Sir Richard Burton & F.F. Arbuthnot
The Unused Potential of Marriage & Sex by Betty Eisner