If you asked the morally supreme they'd say yes, anyone who roleplays their freakon is a sicko and should be isolated from the properly decent rest of society. For that matter to them considering having any fun from it is a deviation in itself (that doesn't stop them from cheating on their legitimate wives with men but that's not of the issue here).
Someone less biased would say there's no harm in this sort of thing as long it's consensual. So as long as it doesn't involve actually kidnapping and raping someone in their basement it's perfectly okay (apart from someone being turned on by such a scenario).
You would probably not get a good answer from a psychology experts cos they never agree on anything, despite what the media tells you, so you're likely to recieve a range of opinions, from "everyone has fantasies" to "you should be isolated right now you freak".
So here's what I'd say (also not very good on psychology wink ). People have the nastiest fantasies (like it's said many women fantasize about being raped) and it all comes down to how accepting their partner is. Some will say no to anything but mish, others will eagerly comply when you suggest to put your hand in their a**. Everyone's disturbed one way or another, whether they'll admit it or not. I'm not into kidnapping but if you (or anyone else) wants to practise it in the privacy of their bedroom who am I to intrude. As long as it's consensual.
Argh, this turned into a rant... Is this even what you asked about? sweatdrop