Research from University College London has shown that male flies that are genetically programmed to produce only female offspring compensate for their low sperm count by growing larger testes. Male ...

Dominant male lemurs flexibly grow their testicles when other males are around, putting them in a better position to successfully mate. In many species, dominant males have larger testes than ...

Cutting-edge technology could prevent male infertility, testicular cancer and pregnancy, said two University of Virginia researchers. Kodi S. Ravichandran, chairman of the UVa Department of ...

Non-human artificial testicles, who would’ve thought!? The saying “one small step for man, one giant leap for mankind” may need to be altered—considering the next step in genetic development and ...