I like big wads myself, to me it's a sign of both the sexual health of the guy I'm fucking and the amount of pleasure he is receiving from getting fucked by me. Now logically I know that some guys produce massive loads and some guys don't and that in fact it might have nothing to do with their sexual health or level of arousal and that a variety of factors can have an effect on spunk quantities, but I still find it a big turn on when a guy blows a bucket load.
That's not to say that I need my sexual partners to be big cummers or I'm not interested, far from it, and in real terms I make no specifications about things like that because I've had wild and crazily hot sex with all kinds of guys with a wide variety of personal and bodily traits and whether a guy cums big doesn't influence how much I've been likely to enjoy the sex I've had with them.
I suppose there's a fantasy element; the cute, big dicked bottom with an arse that wont quit and a total cock fixation (on my cock of course LOL) who blows like a fire house when I fucking him is something I fantasise about, but as with all fantasies one has to temper that template with a does of reality and the knowledge that whatever your fantasies are reality is often much much hotter.