When you are considering a vasectomy, you tend to mention it to other people to get their reaction.

You don't do this to actually get their opinion, of course. You do this to sound it out, to get used to the idea yourself. After all, the doctor is going to be messing around, you know, down there with surgical tools. You don't want to go into this unconvinced it's the best thing. So you ask around. (Washington Post)