A man who respects himself and women to realize he wouldn’t be a good father in the future, and take the big step to ensure he is a whole person.
This is a perfect example of the toxic culture of femininity that damages men who are mature and solid.
Now unlike many men who share their fears and concerns and get blasted (and I mean blasted) by the opposite gender and society. I can see how you feel that you raised a damaged son who won’t propagate your beliefs and future to grandkids.
The other way to look at it is that when you are too old and require care there is a higher chance that he will be able to take care of you as you regress into a child like state, because he will have the time and resources to be able to be there for you at your end days.
If you still desire to project your needs on to his, then I would suggest you help empower him to feel safe and whole as a human being so whatever trauma and things that cause him to shun away from to have kids to help him solve it.
On the flip side, men literally either have to sterilize themselves or use condoms which aren’t that effective, kill the moment, desensitize the sexual experience and are awkward, when compared to natural intercourse.
Maybe if women raised up and helped what few men (Because society actively keeps guys down in these areas), to push to come up with a chemical option then maybe it would be ok.
The last piece of advice is if you use shame and blame, you are 100% guaranteed to never have grand-kids “ever”. On the flip side, do realize your parenting was good enough for your son who doesn’t feel safe in having kids in a committed relationship to say no, which is a hard thing to do as a man.