Hallelujah

And in an ideal world everybody relies on their own birth protection, men wear condoms, women take the pill etc. then the unwanted pregnancy rate would be extremely low

If you use the "stopping the bullet" analogy the woman fires one shot (the egg) and the man fires millions (the sperm). On a biological level it's easier to stop one bullet than trying to stop millions of bullets. That's the problem with male birth control pills, you might stop most of the bullets but it only takes one to cause a problem ...

Some girls are on birth control because the have heavy or really long periods

They once tested sperm control, but one of the side effects was aggression and depression... Also in some cases extreme wait gain... Just saying :) (I'm a girl)

But that's no fun ;)

the best control is to not shoot or to abstain, go for abstinence haha

That isn't even brilliant, as there is a such thing for it. Vasectomy.

Just pull out m90