Maybe it's a combination of:

A lot of uncircumsiced men do have foreskins that pull all the way back when erect

It's difficult to make a realistic looking uncircumcised dildo

A woman really can't feel the difference between a circumcised and uncircumcised one when it's inside her.

So what would be the point of going to all the trouble of making one if it's going to be harder to make, not look realistic and not feel any different to the consumer?

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