Generally yes - few men want to watch their wife/partner sucking or fucking a cock smaller than theirs. With the average just around 5", many women fantasize about taking a much larger cock.
That said, my wife has "pity fucked" a few small guys. It's always so humiliating for them however - they almost always prematurely ejaculate, or can't really get hard enough, thick enough, or long enough to penetrate her. Instead, they blow their loads from the wet friction of trying, but being unsuccessful in fucking her. Pretty sad...
