The way I remember this topic it went something like this:
There will be a class of people that don"t die at Armaggedon ,will continue to have children if they are still of fertile age (at that time) in the 1000 year period,but will stop having children near the end of that time for the earth will then be full from the births and the ressurection.
The ressurected ones will never be able to have chidren and just have to watch the Armaggedon survivors have kids for the remaining time of the 1000 years.
Nowhere has the WTS said genitals won't be there on either group ,that is , both groups seem to lose their desire to have children .
It seems the WTS leaves this one alone passing over to Revelation to explain that "new Scrolls " will be opened and only then will people know the full limits of Gods plan.
It would be silly to presume men's penises would drop off and women's wombs fall to the floor.
But then all this is absurd for think about it in this context : a sister of 25 marries this year ,Armaggedon comes next year , in 900 odd years say she ceases at gods will to stop having babies ,what then ?............she carries a complete set baby producing organs for eternity !!! Is god going to stitch up all the vaginas and leave a pee hole only?? or leave all those vaginas to tempt the men who still have penises so they can fulfill the WTS teaching that anyone who sins after the 1000 year reign will die instantly?
If I was living then I'd have have to ask the women "what are ya gonna do with that thing now ? I'm still using mine to piss on the garden but what's yours for ?"
Perhaps Jehovah creating black holes in space was really a forgleam anti typical of the womb of the future?