Roughly two months after gay couples in Virginia won the right to marry, an 'ex-gay' group's message on a billboard in Richmond is stirring controversy.

The group Parents and Friends of Ex-Gays and Gays (PFOX) promotes the message that gay people can – and should – change their sexuality.

Their billboard on Interstate 95 includes an image of identical male twins under the caption: “Identical Twins: One Gay. One Not. Nobody is born gay.”

Beth Panilaitis, executive director at Rosmy, an organization which supports LGBTQ youth, said that she was shocked by the billboard's message.

“I am shocked and really disappointed that at the end of 2014, we have a billboard in the middle of our city that says that kind of hate,” Panilaitis told CBS affiliate WWBT. “No young person or adult should be walking down the road and see something that says that they are not okay as they are.”

Bill Harrison with the Richmond Gay Community added: “We do not know why people are heterosexual. Maybe when we figure that out, we can determine why some people are not. What we do know is that this type of therapy has caused many people to commit suicide.”

PFOX Executive Director Regina Griggs defended the billboard in a statement.

“We find it interesting that the attacks against the billboard and ex-gay community have nothing to do with the facts,” she said.

“Identical twins have the same genes or DNA. They are nurtured in equal prenatal conditions. If homosexuality is caused by genetics or prenatal conditions and one twin is gay, the co-twin should also be gay. … Because identical twins are always genetically identical, homosexuality cannot be genetically dictated. No one is born gay.”