What if there's more than one sex in these little grey dudes who are
obviously from zeti reticuli. Now, they came in the 40s and decided that humans are hot, and now they are harvasting our tissue to make themselves hot as well. Once a species hits a certain technological level, normal interspecies relations don't cut it any more. They're project here on Earth is to satisfy some fetish on whatever they have that resembles the internet.
In conclusion, the lights attract other UFOs, abduction is all about the kink factor, and light is both a wave and a particle
at the same time!