We probe the butts of “lesser” creatures all the time with often no purpose but to satisfy our curiosity.
You can bet the farm that if we master interstellar travel and find ANY creatures out there, we will probe the heck out of all their butts. Some people will even dedicate their lives to studying the creatures. Just like people have been studying animals found in the Amazon jungles or deep oceans for generations.
I think it’s safe to assume that advanced creatures willing to travel such long distances would be just as curious as we are.
Cold thermometer, veterinary office, cat is quite horrified.
Yes, alien abductees got the xenothropology veterinary treatment.
/ kidding.
Do dogs sniff other dogs butts?