The only totally reliable method of contaception is never to have sex, and never to allow a male to become sexually arroused near you.
That said, it's not much fun, so compromises have to be made.
In reliability terms they are all much the same.
The form of contrception that has the fewest side effects combined with the highest rate of success is condoms. Used correctly, an average couple have a 2% chance of conceivig in any given year of having regular sex with condoms.
Many people dislike condoms as they kill sponteneity and need to be cleaned away - hormone contraceptives are reliable and relatively risk free, although as several people have observed, they can destroy your libido, cause you to gain weight, affect moods and so on.
Some women who use hormones suffer reduced fertility for years after they give them up.
Sterilisation has risks associated with the procedure, as does IUDs and implants - sterilisation is not always reversible.
Male sterilisation is less invasive than female, and safer therefore, it is very reliable, but not 100% - it can fail, and there is always the issue of falling pregnant by another man - if your life changes and you have a new partner, it doesn't help that your old man has no sperm.
Many people double up - condoms and hotmone contraceptives are a popular combination - especialy for women who are likely to have seril relationships or multiple ones.
Remember the key thing is if you cannot risk having a baby, don't have sex. If you are morally totally agasint abortion or post coital contraception, then be aware that there is a tiny chance that you may need to have a baby at some point.
No matter how reliable your method of contraception is, you are many times more likely to have a baby evn with it in place than you are to win the 6/49 style lottery (most people kid themselves that "it won't be me" on babies, whilst at the same time thinking "it will be me" on lotto - go figure).
There is a name for people that use the rhythym method (and withdrawal) - the name is PARENTS.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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