[Retroman]

I don't see any countries on that photo that fall in line with the 12+ category/colour?

I personally think it doesn't matter, as people have obviously proven that they'll have sex whenever they like.

However, believe it or not some people are influenced into having sex around the legal age/after the legal age, instead of before...
Which should be considered a good thing, considering the amount of teenage pregnancies and STD's.

One thing I will say is that it shouldn't be lowered.
Say for example 12 year olds think it's ok to have sex [which just makes me plain sick at the thought of little kids that age doing such things.] then people even younger than that will know they're approaching the legal age and start thinking about sex at nine or ten years old. If 14/15 year olds are legally allowed, then more 12/13 year olds will be having sex.

The age of consent doesn't normally effect the individual in the majority of cases, but it does affect the overall statistics for pregnancies/sex/STD's at least slightly.

Perhaps if it was increased to 17/18 [nothing too high, or else people will compeltely disregard the law altogether.] then a few less people would have sex before then and a few lives might be saved, STD's prevented, and unhappy single mothers produced, kids without fathers or kids placed in care etc.