Some monkeys have a bone in their penis. Humans do not, as far as I know; haven't checked them all. So yes, a skeleton can get a boner, but only if it is a non-human skeleton.
Madness string 102096
Be soft. Do not let the world make you hard. Do not let pain make you hate. Do not let the bitterness steal your sweetness. Take pride that even though the rest of the world may disagree, you still believe it to be a beautiful place.