It's all about infidelity, a secret affair, internal struggle and a final give up of a married woman.
Sometimes it invloves a kind of moral humiliation, especially when a decent wife can't resist an overwhelming sexual pressure.
I used to have a blog with the same name on Tumblr.
I don't possess any rights on any pic/gif, so, if you feel your copyrights are being violated here, just let me know, and I'll immediately delete a pic/gif in question.