Oh, come on, that is such bullshit. Nowhere in canon past about mid-Perez is there anything that remotely establishes Diana as a virgin. Even Jimenez put his dumbfuck inanity about that in the mouth of Circe, part of a rote and meaningless-in-any-literal-sense insult from a completely unreliable source.
And even if she were, Bruce is equally viable as a virgin, so you're still not contradicting my point. Damian was made from frigging stolen sperm! Never has a male lead been given so many excuses to keep his pure temple of a body out of the grip of those tricksy corrupting wimmins.