Ha ha ha ha heh hee hee hoooo ha.
No.
If you're serious about raising the AoC, please refer to the first line, only imagine that it's louder, as though in all caps.
But srsly folks...
Let's assume the national age of consent were raised to 21 in the USofA. On the plus side... I see no advantages. Teens get pregnant no matter what because they fucking can. Some girls are so ass-retarded they want to get pregnant as soon as their ovaries send out their first eggs. And boys and men of all ages will donate the sperm necessary to fertilize those itty-bitty eggs. Oh, and let's not forget that you'll have a huge majority of the US military in an outrage, since a fair amount of them join when they're 18-20 years old, meaning they're old enough to fight and die for their country, but god fucking forbid they should have an orgasm or three with someone else.
Cons? How about a dramatic rise in statutory rape? Someone decides to change the 18 to a higher number, and because of that, we suddenly have an exponential increase in people who are, because of some ink and paper, criminals.
Devil's advocate, OP. Pros and cons of LOWERING the age of consent by 3 years, from 18 down to 15.