Sex and metaphysics

My essay “The Metaphysical Foundations of Sexual Morality” appears in The Palgrave Handbook of Sexual Ethics, edited by David Boonin.  You can view the anthology’s table of contents and other information about it at the publisher’s website.  The book is, unfortunately, as expensive as academic books tend to be, and thus hard to get hold of for those without access to an academic library.  But you can at least read a big chunk of it via the preview at Google Books.