muffler85: it's not sad, actually depending on how you calculate the average number of sex partners that most people have had, it's one (if you use the mode - for those who have forgotten their primary school maths, that means the most common number of sex partners across all the people surveyed).
On the other hand the mean number of sex partners (for maths dunces that's the total number of partners divided by the total number of respondents) is around 12 for men, but less than 20% have actually had that many. How does that work? Well, it's because a few guys have had a lot more than 12 (like, hundreds), and most of the rest have had only a handful - so it averages out in between.
To complicate things, guys report having had more sex partners on average than girls (who have around 7; though again, this doesn't mean that most women have had that many). But logically, leaving aside homosexuality for now, that can't be right: the mean number of partners should be around the same for both sexes. The usual explanation is that men tend to over-estimate, and women tend to under-estimate.