Early- to mid-20th century visions of sex in the future

Robot boyfriends:

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From 1933 - 100 years in the future the State may control all mating, with eugenics the chief thought in mind:

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The Future: Electronic Mating. A look into the more rational marriage choice of the future:

The rest of the article and the full text are here.

Barbarella:

SPACE: the final, full-frontal frontier… the last hurrah… to go where no man has ever gone before, the forbidden and yet insidiously alluring planet of NYMPHON in the second quadrant of PHI DELTA PUBIS, hard by the tumescent moons of GLUTEON MAXIMUS:

More at Flashback, some of which is NSFW.