@vnemerald:
Some guys would call themselves daddy on their profile or during sex. That would be the easiest way to know.
In case if there are no hints around, just ask him, maybe not right in the middle of a hot session to avoid the risk of turning him off.
You could try "btw, is there something else you like in bed?" and then try to fish it out of him or get him to ask you back.
That's a plan..
:cheesy2: