Can i pay more than once so i can give a copy to a friend? cus there are some multiplayer games here i would like to get.

you can purchase and gift it i believe, i think you just purchase and select purchase as a gift in the cart dont you guys?
e: yep on the item(game) page, you select gift this for a friend not purchase.
you have to purchase the item one at a time though.

I don't really understand how this is a question, but I'll answer anyway.

It really isn't difficult at all, on the checkout page, there is a checkbox for "this is a gift", check that, then either type your friend's e-mail address in the appropriate field to send it directly, or type your own to get the code and give it to your friend in another manner (scribbled on a piece of paper, whispered, sent via sms, ...).

You can't buy 2 or more copies of the same game at the same time, so buy 1 copy normally, then buy one more "As a gift", send it to your own e-mail, then PM the code to your friend. That's the easiest way to do it.

...written on your "little friend" in magic marker so that your girlfriend has to put in a little *ahem* effort if she wants to read the whole gift code to the fun cuddly game she wanted so much. Not that I've ever done that...

I... have no experience with that. That would require a girlfriend. Something I've thus far been unable to acquire.