I think they are naked because they don't have 'private parts' to display. They are sexless creatures who multiply by cloning themselves, instead of having sex

I think they are naked because they don't have 'private parts' to display. They are sexless creatures who multiply by cloning themselves, instead of having sex / courting. > In the end, there's a pretty good chance aliens visited us already. And other theories suggest they interbred with us, and that we are hybrids.