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Pregnancy prevention is not the issue, it's STI transmission that must be prevented, especially in africa.

I doubt we will have a viable substitute for a latex barrier in that regard until some sort of pathogen-hunting nanotechnology becomes mainstream. By that point we may well have transcended our present notions of sex/gender altogether.

With regard to pregnancy prevention for men, there has indeed been recent innovation in this area: http://www.theregister.co.uk/2011/06/06/male_pill_boffinry/

There's a new and interesting product that's been discussed here on HN a couple of times: http://www.wired.com/magazine/2011/04/ff_vasectomy/

As JonnieCache said, it's not about pregnancy, but you may be interested in this: http://www.wired.com/magazine/2011/04/ff_vasectomy/

(We're all adults here. You can say "penis.")

It's not for the want of trying. There's ongoing research into a male pill, for instance, but it has yet to yield results.