To their defense: That pic is from the In Trance/Virgin Killer line up, long before their first American tour, long before Love Drive, Blackout and, yes, Animal Magnetism. We don't have a lot of sun in Germany and there were no tanning studios back then.
I guess they were aping the bare-chested UFO look that was at that time typical for Way, Mogg, Parker and lil' Schenker.
Rob: Ritchie once said about a tour of Rainbow together with Saxon, Krokus and Scorpions, circa Straight between the Eyes-era: "I think the Scorpions are the best of the lot, they have a sense of melody. The others are a bit heavy-handed for me. And the Scorpions are harder to beat at soccer, Rudolf is a great runner."