In the future, the compliment to give a guy will be to say that he's hung like a rabbit. It'll imply that he has the super-high libido that comes with fully-functional, custom-engineered penises like those being successfully implanted in bunnies.
I don't know how the fluffy creatures lost their most precious parts in the first place, but scientists decided to grow entire penises from scratch and implant them into a group of rabbits. The results were fully functional, completely responsive sex organs in all the rabbits and "when given the chance to have sex, eight [of them]were able to ejaculate, and four became fathers". Impressive conception rate considering they were working with brand new equipment.
The hope is to one day reproduce those results for humans and aid those requiring penile reconstruction. Until then though, I suppose that "replacement penis" will keep implying the involvement of batteries. [Wired]