Commercial sperm banks have operated in the U.S. since the early 1970s. Today, women who can afford to use them tend do so without stigma. But banks are no longer the only source for women hoping to get pregnant.
There are informal, unregulated websites popping up where men who are willing to donate their sperm for free can meet women who are hoping to have a baby.
The most established sperm donation website in the U.S., the Known Donor Registry, launched in 2010. Since then, it has grown to more than 16,000 members.