Seriously though, this thread is 'sex positive' to a fault.
Unfortunately I am not articulate enough to verbalize the concept I have in my head well enough, but safe to say some parties in this discussion are being a little... silly.
Gender roles are a thing. They make sense, they're rooted in nature.
I don't expect my little lady to get into physical fights to protect me.
Oh my, what an insult to her equality, and such a double standard she is setting on me!!
How dare anybody suggest sensible division of labour....
At the OQ:
There is a primal desire for some women to consume/envelop/be injected with male seed - regardless of the method of administration.
There isn't as much of a primal desire of being inserted into, from the male perspective. For example, I loved to make an ex squirt over my face - I delivered the orgasms. Did I like to receive those orgasms down my throat, inside me? Not my thing.. the excitement for me is not 'consuming the reward,' so to speak.
Common sense must be applied here.