I was thinking about posting something along these lines, so I'm glad to see the topic here.
I've occasionally wondered what it is that makes some people fetishize certain sex acts -- like oral sex. Some guys (I can't speak for women) are so into oral sex (giving, receiving, or both) that it's to the exclusion of all other forms of sexual play, and sometimes, for the guy sucking, to the exclusion of experiencing an orgasm himself. I admit that I've got tendencies toward fetishizing oral sex, but without any regret.
The arguement could be made for the whole Freudian gestalt with people being stuck in one phase or the other -- and while it's a good basis for understanding, I'm not convinced it's the end of the story.
I love to get sucked off. I love a talented, good looking guy sucking and deepthroating me, taking his time to enjoy sucking as much as swallowing. I love a guy who's got the patience to suck for an hour or more, content with that, but knowing that regardless of how much he loves sucking, he loves swallowing even more. I have absolutely no idea why I prefer this above all else; it's not like I get any less physical pleasure from other sex, but I do know I get less mental stimulation from other sex.
I love guys who have technique, guys who are confident in their talent, and ravenous in their appetite. That's not to say I won't reciprocate in a lot of instances, but it all goes back to fetishizing oral sex in one way or another.
Not sure this is what you were looking for in responses, but it seems appropriate, perhaps. :P