yournamehere

There used to be many short, low-res clips out there because of limited storage on hard drives, but I was downloading 700+ MB movies on Kazaa as far back as 1999. It took forever with a 56 kbs modem, but I just let it DL all night.
With technology giving us cable modems, digital cameras and ever-increasing hard drive capacity, though, naturally porn files are getting more abundant and increasingly larger.

Also, Viagra really changed the porn industry. Porn scenes from the 70s , 80s, and early 90s lasted 10-12 minutes. Now, they average 25-35 minutes, with multi-camera editing stretching some to an hour.

Technology is great - my first hard drive was 40 MB. Nowadays, that's a 4-minute avi file at 640 x 480 resolution.

Oh, and genuinegirly, the O.P. was worried about his mom finding his porn; not his wife.

EDIT LATER: I just saw a couple clips on a favorite porn site that had two 20-minute scenes that were over 900MB each!!! Yikes!!

__________________
If you want to avoid 95% of internet spelling errors:
"If your ridiculous pants are too loose, you're definitely going to lose them. Tell your two loser friends over there that they're going to lose theirs, too."
It won't hurt your fashion sense, either.