[JediScum]

Hungry is correct, in that STD's do not appear overnight.

I myself have had peculiar feelings, similiar to which you describe, after masturbating 8 times in one day. However, they disappeared within 12-24 hours.

Also, from experience, this sounds like the "friend" got a ruthless anal dicking without a proper strecthing. I say experience, as I tried to fit my own fist into my ass once. But I took an hour to "relax" the muscules involved as well as using lubrication. You can't just jam something in there, y'know.

Seriously, the only way I can think of someone feeling something in their thighs, rectum and balls (that prostrate gland, y'know), but not the penis proper, for SIX DAYS, is via by being a bottom in vigorous anal sex.