Bareback gay pornography was standard in "pre-condom" films from the 1970s and early 1980s. As awareness of the risk of AIDS developed, pornography producers came under pressure to use condoms, both for the health of the performers and to serve as role models for their viewers. By the early 1990s new pornographic videos usually featured the use of condoms for anal sex. However, beginning in the 1990s, an increasing number of studios have been devoted to the production of new films featuring men engaging in unprotected sex. For example, San Francisco-based studio Treasure Island Media, whose work focuses in this area, has produced bareback films since 1999. Other companies that do so include Spunk Video, Lucas Entertainment, SEVP, and Eurocreme. Mainstream gay pornographic studios such as Kristen Bjorn Productions have featured the occasional bareback scene such as in "El Rancho" between performers who are real-life partners. Other studios such as Falcon Entertainment and Spunk Video have also reissued older pre-condom films. Also, mainstream studios that consistently use condoms for anal sex scenes may sometimes choose editing techniques that make the presence of condoms somewhat ambiguous and less visually evident, and thus may encourage viewers to fantasize that barebacking is taking place, even though the performers are following safer-sex protocols. (In contrast, some mainstream directors use close-up shots of condom packets being opened, etc., to help clearly establish for the viewer that the sex is not bareback.)