LOL. SLI motherboards are normal motherboards, too.
No, you don't have to get an SLI or CF or SLI/CF motherboard if you don't ever plan on adding a 2nd card. But if you see a board you like, don't hesitate just because it has a 2nd PCIe x16 slot. And if you do plan on someday using a 2nd card, be sure to get a board with X8, X8 PCie or better. Stay away from X16, X4 boards unless you only plan on using one card. The X4 slot will drag down performance when using 2 cards.