"This is amazing to see and they're both absolute beauties," one viewer posted. "They're matchy matchy," another added.

"Mating ended when the females regained control of their arms and pushed the males off," the researchers noted.

"I just love dachshunds," one viewer said, while another added: "How dare you minimize his daily accomplishments." ...

"Awww, he really missed his big brother," one viewer said, while another added: "Glad they are together again." ...