[Dimensio]

No, nobody can cite a source for that because it is a made-up statistic.

A source can be cited, though. Typically it goes back to the discredited Paul Cameron. Many decry criticism as part of the "homosexual agenda", yet they never actually try to counter the specifics given within the criticism (such as the explanation of how his 'homosexual lifespan' study was total bunk involving utterly worthless methodology).