And I saw, and, look! the Lamb standing upon the Mount Zion, and with him a hundred and forty-four thousand having his name and the name of his Father written on their foreheads. ...These are the ones that did not defile themselves with women; in fact, they are virgins. These are the ones that keep following the Lamb no matter where he goes. These were bought from among mankind as first fruits to God and to the Lamb, and no falsehood was found in their mouths; they are without blemish."
So why don't they just say that the comment regarding 'virgins' is to be taken literally after all. There's been so few of those around, they could delay things for hundreds of years if they felt inclined.