Michael Castleman is a journalist and author of best-selling books on sexuality, health, and the history of book publishing. He also writes fiction.

Premature ejaculation is men’s most common sex problem. “The Cure” can cure 90 percent of them.
"The most practical, authoritative, and comprehensive childhood-to-old-age sexuality guide ever written.” Eli Coleman, Ph.D., chair of the Human Sexuality Program, the University of Minnesota.
Michael’s “All About Sex” blog attracts 200,000 views a month, and has amassed more than 58 million total views.
Kill Weed book cover
Michael’s Ed Rosenberg mystery series features a newspaper reporter sleuth and San Francisco history.
New Healing Herbs
The quality of Castleman’s consumer health guides persuaded Library Journal to call him “one of the nation’s top health writers."
During a 50-year career, San Francisco journalist Michael Castleman has published 19 books and more than 3,000 magazine and web articles.
Great Sex Guidance on substack
Michael writes a weekly column focused on recent, compelling sex research.
Got sex questions? Michael answers them quickly—for FREE.