OK.
Here's what I want to know.
The OP says the "soap" was used for several days.
So you mean to tell me the person spread water laced with semen on his/her body for several days, and didn't notice? Come on. The fact that it didn't lather up didn't alarm anyone? The fact that the secure fastener was broken didn't alarm anyone? Or are you saying that partway through the stay, the contents of the soap bottle were changed and the fastener broken?
I'm calling shenanigans on this story.