depends on how young. You said women. I'm guessing 18 and over. Most natural reason is: they want to reproduce. For some reason we are created or you could say, hardwired to want to reproduce. Hopefully, it will be a long thought out decision. Raising a child is a HUGE responsibility often without any support, and I am certainly including the father of the child. Grandparents could go either way.
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There is not a specific answer to this but there are many things attributing to this factor:
because some girls have more of an intrest in sexual things more than other girls, and some mature before other girls so therefore they would be more sexually active.