standard fan service. the whole thing is a novelty and it was good for a match or two in HCtP. i guess people must really want to spank each other in some weirdo homoerotic fantasy. but yea, in the article they pointed out that when you spank them, they scream, and the harder you spank them, the louder they get and the wilder their animations will be. maybe not wilder, but they'll probably flail around a lot more during their spanked animations.
submissions also use a time based countdown of sorts (Rumble Roses uses a similar thing). i guess everytime you slap one on, the time increases making it harder for your opponent to break out of it.
