I think it comes down to that when a man and a women have sex the penis is usuallly hard and therefore the head itself would stick out at the top. I have seen dildo's where they have tried at least to have foreskin on it. It was just behind the head and was what I can only describe 2 rib like rings that merged into the rest of it. So to answer your question, yes they do make them but it is just for look rather than anything else. Don't ask me if the ribbed rings do anything for the girl though.

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My stories
An erotic story
The instructor and student
Secretary learns how to take a dicktation
The story of sister stephanie