How effective are condoms?!

Condoms are very effective if they're used correctly. In particular, when you're putting it on, be sure to squeeze the tip of the condom to make sure there's no air trapped inside. Trojan condoms are considered the safest, but Durex is a major brand too.

Yes, using the condom but pulling out before you come is a possibility, but it takes a lot of self-control, and will greatly reduce your enjoyment.

Do not wear two condoms at once. They'll rub against each other, and it'll be likely for both of them to break.

To be safest, your girlfriend might want to see about getting on the pill, in addition to using condoms.

Even though condoms are said to prevent pregnancy and to practice sex without any side effects, condoms are not to be fully trusted and have many things that can go wrong while using them. Condoms can easily break without you even knowing and cause pregnancy. Even the slightest of tears can lead to pregnancy. To make it more effective, try wearing two condoms and have your girlfriend take the pill. This will be sure to protect against anything unwanted. If your girlfriend is very uncomfortable with having sex and she is afraid of getting pregnant, do not force her to do anything she does not want to do. Remember: the best way to protect from getting pregnant, is to not have sex.

One of my friends got pregnant even when her partner used a condom.

Remember the one thing you pay retail for is CONDOMS so if you keep using this brand you should have a 99.9% chance of her NOT getting pregnant. Though if I use Trojan(my personal preference)

To put your girlfriend at ease, tell her to get on birth control. Most condoms can be effective if its used properly, and if you want to do that then that's no problem.

keep it on, you won't get the chick pregnant unless it rips or jizzlobbs come up the sides into the abyss.

99.9%