That's all good advice, but a bit superfluous, in my opinion.

Though I would recommend getting used to the condom ritual, you should also keep this in mind: Always piss before sex. Always! You must take care of that function before expecting to maintain an erection.

And the best way to put a condom on is this: After you've relieved your bladder, lean back, and have your girl go down on you while you fumble with the condom. Once you've got it unwrapped and facing the right direction, plant that sucker on and flip your girly on her back. Be quick! Once you're inside you shouldn't have too much of a problem staying hard (if you've followed my advice about urination.)

It's all about timing.

Good luck and happy humping!