Magnerobo Ga-Keen
Japanese title: マグネロボ・ガ・キーン
Alternative titles: Magne Robo Gakeen, Gakeen Magnetic Robot, Robotman Gakeen, Magnetic Robot Ga Keen, Magnos Robot
Type: TV
Source: Original
Episodes: 39
Status: Finished Airing
Aired: Sep 5, 1976 to Jun 26, 1977
Broadcast: Unknown
Duration: 24 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Toei Animation
Producers: TV Asahi, Oh! Production
Genres: Action, Sci-Fi
Themes: Mecha

Dr. Kazuki, who perceived of an invasion of Earth by the Izaru people builds a robot based on the science of magnetism and sphere joint theory. Undergoing a dangerous augmentation process, Dr. Kazuki's daughter Mai becomes the pilot of "Mighty" or "Magnetman Minus". Takeshi Houjou becomes the pilot of "Puraiza" or "Magnetman Plus". 

The pilots would hold each other and then physically trasform their joint bodies in a metallic plate locking itself on the Gakeen (Short for "Gathering Keen") robot's frame thus enabling the super robot to move and fight. This sequence was notable, to an adult's eye, for its almost-sexual connotation.

(Source: Wikipedia)