Hi Remmo,
It's a very good idea for you to read about birth control. First, if someone's penis is coming anywhere close to your vagina, there is always a slight chance, even if he doesn't penetrate, of pregnancy occurring. Even though the chance of that happening is very very slim, it's not a risk you have to take! Also, it can be very difficult to stop sexual activity prior to intercourse in the "heat of the moment." so this is another good reason to protect yourself both from potential pregnancy and sexually transmitted diseases.
Regards,
Jennifer L. Fee, Psy.D.
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