Now if you were into BDSM - a lot of these people would concur that *B/DL is really related and tied into the scene, and here's why. Typically when wanting to ageplay or roleplay with a mommy or daddy, it means you, the *B is submissive and the mommy/daddy is dominant. So *B would be subject to spankings if the dominant feels you deserve it. But what I discovered from others who enjoy dominant/submissive relationship realize it's important to be honest and upfront - maybe so far as a contract as to what you'll agree to happen to you in that situation.
Now for myself, I don't want to be punished, it reminds me too much of what happened when I was younger, so conjures up too many memories. Therefor I make it pretty clear about what I'll accept, otherwise I refuse to participate.
For others, well being spanked, in and of itself can cause someone to be quite aroused by it, but not I.