What Is The 'Withdrawal Method'?

The withdrawal method is when the guy removes his penis before ejaculating. This is not a fool proof method as guys tend to pre-ejaculate for lubrication and this can also get you pregnant. As a matter of fact, it is more likely this will get to the egg much faster as it is driven in deeper through the motion.

I hope this is not to graphic for you but I am also concerned as you said your BF is 18 and you 15. Please do be careful!

It's a risky & often times a "too late, you are on track for a baby".
Withdrawal today means only from a condom. Babies and medical conditions await this foolhard approach to only a little way in or I'll stop before I finish....Yeah, famous last words!

My guess would be: A complete pull out before climax.

The withdrawal method is when the male feels like he is getting ready to cum, he "withdraws" his penis before ejaculating. This is not a good method of birth control as your precum has enough sperm in it to get your sweetie pregnant. Best to use a condom or just have oral sex.