If the soap analogy is too much for adult brains to handle, skip it. I would think as adults, we should be quite fond of, and familiar with soap.. Soap shouldn't be quite that disgusting for you two.
Soap isn't. It is the equating women with inanimate object like soap.
A female partner might have a past that is more sophisticated than a newly unwrapped bar of soap. But as a sentient human she can tell you about it.
A bar of soap can't.
And I didn't see anything in that post suggesting that male partners "sophistication" was similar.
Tom