It will stop ground-traveling wildlife.

I wouldn't recommend having sexual intercourse with a wall. It's likely to be unpleasant.

Much of the border runs down the center of the Rio Grand River. I can't wait until they try to build a "wall" there...will likely travel there from Michigan just to watch. Also, with most illegals entering the U.S. legally and then overstaying their visas, will have to build a wall around all the international airports (Oh, oh...I hope Trump is not reading this...he will likely propose that also.).