Um, Congress, can I introduce you to the internets? The internets, this is Congress. At the risk of stating the painfully obvious, it is impossibly easy to find real graphic sexual content, for free, much easier than loading a mod and using it. I guarantee you, the GTA porn mod something a kid will only use twice -- once to see if it can be done, and once to show a friend. "Yeah, that's pretty cool."
Then they'll go back to downloading free porn. I guarantee you, if the internets had been around when I was 15, I'd have only come out of my room for more beef jerky and Mountain Dew, to power up for the next "session".
Ah, but at least our elected representatives get to look they're doing something. Hey, how about taking advantage of a corrupt administration on the ropes, and fucking finish them off already, before wasting time on video games?