Contraceptive effectiveness?

1) "Pulling out" is NOT a form of contraception. Even if the guy does not ejaculate inside of you, there is something called pre-c*m (pre-ejaculation) , which is small amounts of semen that leave the penis before actual ejaculation.

2) Condoms and the Pill are only about 97-99% effective. If not taken regularly, the Pill is not very effective since it needs to be taken everyday and at the same time. Condoms can break, slip off, or be damaged. Both of those forms are generally reliable, however. In other words, yes, those numbers represent the chances of getting pregnant.

3) No, I will not add those numbers, because the concept is simple enough. If you are engaging in sexual activity and do not want to get pregnant, take the Pill. The Pill is more effective at preventing pregnancy when used with a condom. Spermicide is useful when used in conjunction with condoms. Using all three will decrease your chances of getting pregnant, but NEVER depend on "pulling out" as a form of birth control.

4) If you are that concerned about getting pregnant, remember the safest way to prevent pregnancy. Abstinence is the only 100% effective form of birth control.

Go to www.plannedparenthood.org and it will tell you the likeliness.

Those numbers would hypothetically tell you how many couples using that method would get pregnant in a year. However, some of those numbers are wrong. 3% of couples using condoms get pregnant if they use condoms correctly, but it's much higher for most users, because most people don't use condoms correctly.

No, you don't add those numbers. If you did, you'd presume that each method is used by the same number of people.