How effective are condoms as a method of birth ...

Ask my son. He's a daddy now!

You should be on the pill or the spermicide creams as extra protection.  The creams also act as a lubricant.

Or try outercourse.  Or if that is to hard, teach him how to go down on you to make you cum and then do him. Lasts a lot longer and a whole lot safer.......................................

85% with typical usage

Condoms are very effective mostly to prevent STDs, but not so much to prevent pregnancy. However, if you use them together with Spermicide, it is much better but still not as good as using hormonal things like the pills, implants, IUD, vaginal ring or the Depo Provera injections.

well condoms are 90% safe and easy way of birth control, so always remember to indulge in safe sex please use a condom and be safe and also advise are other friends to do so here lets send them some rubber via http://sendsomerubber.com/