If the OP meant his post in the way most are interpreting it then I agree 100% with the condemnation, no question.
However I do wonder if what he actually meant was that you persuade a WG to do something with you that she would not normally offer. Completely consensual. My only personal example would be I asked a WG I had seen a few times if she would give role playing a go despite it being something that she said on her profile she did not do. We gave it a go and it was A laugh. She still does not offer it but I honestly do not believe she was offended or annoyed in the slightest.
On a slight tangent I remember having a great BJ and building to an explosion but could not remember if she had CIM on her likes. She seemed to be going for it but just in case I asked the question, answer a definite no. We need to be respectful.
Interesting point. In that exact situation, you know what I would do (and have done)? I wouldn't have asked if she was going to CIM because it might simply have reminded her
that she didn't do it. I would simply have made it abundantly clear that I was about to cum (perhaps even uttering the immortal words
I'm cumming 
) and simply see what she did as events unfolded. On a few such occasions over the years, I have unloaded into the girl's mouth, perhaps even with a swallow thrown in

. In this way, I haven't been deceptive, and the WG has made the choice, on the spot.
In the heat of the moment some WGs will do stuff not on the list because they are actually getting off as much as you are. Small example from me, after rimming the fuck out of a hot teen WG I saw a few years ago, she obviously decided it was a horny thing to do because it was making
her moan so much, and she then proceeded to do exactly the same thing to me, a guy old enough to be her dad. It wasn't on her Enjoys list, and when I asked her afterwards she said she'd never done it before. I'd like to think her next bf would have thanked me

.