Seriously, I never did a count on them, but my little black book contains some names. However, those only reach back for a shorter time span, altogether, I really can't tell how many big boys I've had. Currently, there's one, and another one I know, but currently we're separated geographically. Won't be so in summer!
I'd, however, say that the big/huge ones are, in numbers, second behind the average/above average guys I've been with. Something's going wrong if the minority of men makes the majority of your dates.