Well, I'm 24, girl at heart sometimes,
Anyways, I have five bearded dragons, a water dragon, six corn snakes, a brb, ball, and bci. Oh and a tarantula and I raise mealworms and cockroaches, so as you can see I'm not a girly girl, lol!
My herps are a very big part of my life and couldn't imagine it without them, I have broken up with a guy because he didn't like snakes enough!
I work with Colorado Reptile Rescue, and most of the members are women.
I think a relationship is built on respect, your gf should respect your love for scalies, if she can't, in MHO you shouldn't be together, but YOU also need to respect this new baby. I'm certain you can balance both, and I have a feeling once the baby is born you will be paying him a LOT of attention (how couldn't you, new squishy babies are cool)
I agree that exposing kids to creepies in a correct, positive manor makes them less creepy and more cool. When I do our adoption fairs I see TONS of kids who think reptiles are sooooooooooooo coool while their parents hate them, somewhere along the line someone did something right, and I see TONS of kids who are terrified while their parents think the scalies are neet.
OK I'm rambling, sorry, Have your gf come on here and read some posts. There are Lots of women on here!

Teenage Mutant Ninja Beardie
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DogStar
"Many have forgotten this truth, but you must not forget it. You remain responsible, forever, for what you have tamed." --Antoine de Saint Exupery