Staying hard after ejaculation?

When I was in my teens and 20's quite often I'd cum and stay hard for quite a while. Now that I'm older that usually doesn't happen. I've heard stories that viagra and other similar things might help but don't know for sure.
 
I'm not sure if there is anything that can be done to keep you hard. However, I'm not sure what the problem is. Use that time to get some water, have a bathroom break, get cleaned up and then come back for round 2.
 
i can get off 6-8 loads on one hard-on... i just keep fuking after i cum and it stays hard...

I say this ain't happening.

I agree with another poster above. Use the time that you go back down to make out, stimulate her with your hands or mouth or whatever, and chances are your hard on will come back on it's own. Perfectly normal.