You may wish your clothing items can fit your character's genitals correctly. So I provide a workflow to help you achieve this purpose.
This workflow should be able to work for any genital props. In the tutorial, I'll use two examples to help you understand and master it.
I have tested it on different clothes and genitals. Please see the promotional images. No matter what gender your characters are, no matter what poses they are and no matter what the shapes of their genitals, you can get decent results with just DAZ Studio, without the need for third-party modeling tools.