Even as worried alien-seekers grapple with challenges of alien invasion, NASA gets new food for thought and fresh advice. Send a condom into space if aliens decide to have sex with visiting humans.

It is strange that before humans locate alien life, they are advocating the limitation of the ET species. Still, there is a lot being said about it. The Swedish Association for Sexuality Education (RFSU), has some bizarre and interesting add-ons too. The condoms should be of different shapes and sizes, as there is no one-size-fit-all condom, they explain. The sexual genitalia of the aliens is also not clear, so the human condoms need to be created imaginatively.

In a video released Sunday, RFSU points out: "We know that you guys something send stuff up into space so that whatever life is out there will get an idea of what goes on here on Earth," the group said. "However, from what we can tell, you forgot to inform the little green people about one super-important object: the condom."

Another voice explains in the video, that "a condom might be handy if they decide to visit earth and find some hot earthlings". Published on World Contraception Day, the RFSU is just hoping that it becomes intergalactic.

In case you are flummoxed about it, you can look at a checklist of all the things that have been sent to space: LEGO figurines, a map of the Earth's position in the solar system, anatomical drawings of a male and a female.

Some humans suspect that aliens might capture humans for "sexy" intentions. If that is true, then it would help if they at least undergo safe sex with the help of condoms.

There are a number of groups after all who want to set up "permanent extraterrestrial settlements." Have they already added condoms to their list of must-take items? It is most likely that they have, even if no one is aware of it.

YouTube/RFSU