Is this an ultimatum that your Mrs has given? Because I don't think the girls would mind either way LOL
If this is a get a Vasectomy on a promise of a better sex life with your partner situation? then personally I would seriously consider her motivation.
She my be trying to reduce your sex drive instead of increasing your sex life.(cutting your balls off in more ways than one)
I know people who have had it and to me they definitely changed personality.
I Have never considered it, all my children were planned.
There's no way in hell I'm letting anyone other than the girls tie knots in my dangly bits!!!😨😱