Most Helpful Guy
I think when guys bring it up at the time they aren't 100% sure what they want but they see the girl really wants it so they just go along hoping that they fall for the idea.
Eventually when time comes where the girl wants to get pregnant right then. The guy realizes that he doesn't want children. So it's not like he was lying before he just didn't know what he wanted and couldn't figure it out until he was presented with it happening.0