Often meetings are arranged through friends or colleagues, and sometimes through personal ads in gay and lesbian newspapers and magazines.
Many scenarios can take place but here's what results in two mommies.
One of the lesbian partners self-inseminates and gives birth while the other lesbian partner, along with the father, adopts the child. Sometimes the father's partner also adopts the child, resulting in two mothers and two fathers. Lesbian couple approaches a single gay male for a similar arrangement, or vice versa. The child, in this case may have one mother and one father, or two mothers and one father. Lesbian couple approaches a single gay male and asks simply for a donation, whereupon the donor gives up any legal connection to the child.