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
I realise you can do anything with your life. There are so many things you can do with your time, but the things that you really should focus on are the things that nobody else can do. The things that only you can do.