How do I change combobox to be dependent on OptionBox

I'm trying to have the combobox to have a dropdown list with female names if the female optionbox is selected and vice versa if Male is selected.

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obfem = option box for female
obmale = option box for male
cbname = combobox for names

This is my code but it doesnt seem to work. How can I modify this?

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I just don't quite understand the need of the sub UserForm_Activate,
because usually I use the sub UserForm_Initialize then make one of the OptBut which I want as the default when the user form is launch to True.

Something like this :

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