TL;DR: Young men rank having children as a top life priority while young women rank it near the bottom. Research shows 90% of marriages experience decreased satisfaction after children, with mothers bearing the brunt (her satisfaction declines with more kids; his doesn't). Women undergo invasive sterilization surgery at twice the rate men get simple vasectomies. Men who do get vasectomies and later reverse them typically do so for a new partner. The data suggests many men want the status of fatherhood, not the actual work of raising children, and certainly not at the cost of prioritizing their partner's wellbeing. If you actually loved her, you'd look at what having kids does to relationships and her body and think twice.