Portals

Okay.
Assume portals, as per the video game Portal, exist and are possible, etc. etc.

If you created one portal on, say, the floor, then another one directly above, you could theoretically fall endlessly.

Given this, would a human continually falling be at terminal velocity until starvation/death from stress?

Assume the portals have been made on linoleum dining room floor and a stucco ceiling. Would it be possible for the subject to move outside the portal to stop? If so, would the impact upon landing be enough to kill them?

The relevant application is to stick two portals on two walls and move the two walls close enough together so that you can fuck yourself and be fucked by yourself.  This has its own set of problems though.