As for anatomy, having balls covering vagina is actually the incorrect anatomy.
See wikipedia for example. When both scortum and an opening are present, the scrotum would be on the side because scrotum is the analog of labia, which is on the side of the vagina.
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But hey, it's all fantasy, they can draw however way they want. We just don't have to like it and people should know the what's reality when they claimthings are "wrong" or "right". There just needs to be a proper filter to filter these things out so my eyes don't bleed.