"Fraternal twins" refers to siblings who are born at the same time, but do not look exactly alike. They develop from two different eggs and can be of the same or opposite genders. Full definition
Lori Bacon — PT, DPT, TLC's Associate for the San Francisco Bay Area and the East Bay, is the proud mother of fraternal twin girls. (twinloveconcierge.com)
Where as with fraternal twins, not genetically identical, if one twin identified as gay the other twin only had a slightly elevated chance, over the general population, of identifying as gay. (religion.blogs.cnn.com)
This is a very common problem, especially for fraternal twins. (twinmom.com)