were some of the first in-browser adult games to capture the hearts (and cocks) of horny internet surfers, because the Flash format (variously called ShockWave Flash, Macromedia Flash, and Adobe Flash) was an early and popular way to deliver games and animations to your browser window. The format's ".swf" file extension (named after "ShockWave Flash") became synonymous with games and animations, and these .swf files were some of the first engaging interactive viral content that many web users ever encountered. There have been probably more in-browser porn games released in Flash/.swf format than in any other games engine.