I don't know about you guys, but I think that that whole "ticking bomb" thing is just a huge fallacy. Maternal instinct? Sure, everyone gets it from time to time, you rationalize it and it goes away. It happens for guys too from time to time and you rationalize it and goes away for a while as well. That is what is so great about being humans, we can rationalize away our animal instincts and act in a civilized way.
The thing is women are socialized as little girls to want relationships and children and what not. Dolls, Kitchen sets, princess outfits, and easy bake ovens. What a joke! I for one wasn't brought up that way. I was brought up playing outside and being one of the guys, me and my brothers had GI Joe's collections and the Star Wars castle. The only dolls I owned I "operated" on them and for a long time I wanted to be a doctor because of that. And I wasn't forced to do anything, I was always given options and chose, and I was always told I could say anything, be anyone, and do anything I wanted. I think that is why I am who I am now and have achieved what I have up to now, and have a great boyfriend that loves me and has stuck and supports my goals and objectives even when that means I have to go away for a long time. He's always there when I return, and I likewise would never stop him from doing what he wanted, and always know he'll be there but if one day he's not, so what? There are plenty of fish out in the sea, you know what I mean?
I think a change in belief structure and way of socialization for young girls is in order if we are ever to grow as women, think independently and be leaders, but let's face it, we are light years away from that happening, so for now, I guess we have to continue to live with the stereotypes and lack of equity in treatment, psychologically speaking, of men and women.