Holsinger peddles junk science.

Jim Burroway fact-checks Holsinger’s 1991 report that warns of the “dangers” of “anal eroticism”:

The whole point of Holsinger’s paper is to draw a sharp contrast between gay relationships and heterosexual relationships. But to do so, he he culls his evidence largely from papers which describe injuries from nonconsensual intercourse to denigrate consensual relationships, he describes odd sexual practices that are enjoyed by heterosexual couples to denigrate the minority of gay couples who indulge in those same practices, and he misleads his readers by padding his bibliography with more references to papers explicitly describing injuries experienced by heterosexual men and women to imply that they describe gay men instead.

In other words, to describe gay sexual acts, more often than not he turned to papers which describe injuries sustained through heterosexual activity … Whatever pretensions Holsinger may have had to presenting a scientific argument, this paper does not rise to that level. In fact, Holsinger deployed many of the same tactics other anti-gay extremists use in writing common anti-gay tracts.

Dale Carpenter has more.