Bandai Tectron series (1983, LCD, Watch Batteries, Model# 3645_)
There are 3 different games in the Tectron series: Na Kobita (green, #36452), Command Leader (blue, #36454), Omorashi Baby (red, #36453). These games have a built-in radio and a small electronics kit that you can use to make the game do various things. One of them can be converted into a speedometer/odometer for a bicycle, etc... (And one of them, the green one, features a girl that gets her clothes stolen by little gnomes... :)
Red (Omorashi Baby):
Green (Na Kobita) (this the game with nudity):
Blue (Command Leader):