heres some info
However, even if the male does not cum
inside the vagina, during sexual
intercourse, the male is very likely to
produce a pre-ejaculate, or pre-cum before
orgasm
A high risk of pregnancy is always present
when a penis enters a vagina without
protection. The withdrawal method, which
it sounds like your friend used, is not an
adequate form of birth control. According
to Crooks and Baur, it has a failure rate
of 20% (2003, p.296). Namely, 20 out women
out of 100 will become pregnant each year
when relying on withdrawal. Sperm can be
in the pre-ejaculate fluids, so a female
can still conceive when using the
withdrawal method
http:
//www.soc.ucsb.edu/sexinfo/?article=faq&am
p;refid=177
This method, called the withdrawal method,
AKA pulling out, AKA coitus interruptus,
is a totally ineffective method of
pregnancy prevention. After a guy is
aroused, and during sexual activity,
pre-ejaculatory fluid, AKA precum, is
secreted from the urethra. The purpose of
this fluid is to neutralize the urethra so
the sperm can survive. This fluid contains
- you guessed it - SPERM! And as we all
know, sperm can very well impregnate a
woman. While the amount of sperm is
considerably less than released during
ejaculation, there is still a significant
chance of pregnancy. Consider this: An
average of 300 million sperm are released
during ejaculation. If one tenth of that
amount is released in the precum, that's
still 30 million sperm, and it takes only
ONE to get pregnant, so wrap it up boys!
Another interesting fact: A girl who
doesn't use protection during sex has a
90% chance of getting pregnant during the
first year.
Pre-cum (or pre-ejaculatory fluid) is the
liquid that may leak out of a penis when
it is erect before intercourse. It does
contain sperm, which is why a condom
should be put on a penis before any
vaginal penetration occurs.
Pre-ejaculate is actually a sort of
lubricant, so it has fewer sperm than the
actual ejaculate, but more than enough to
make someone pregnant because it only
takes one sperm.
Most men can't feel the pre-cum coming out
because it is a kind of a leak and it also
cannot be avoided or controlled. Pre-cum
is one reason withdrawing the penis before
ejaculation or "withdrawal" is not an
effective way to avoid pregnancy.
http://www.pamf.org/FAQ/FAQ/
fx=q/id=19/t=a/c=9/a=13/tid=1/kw=1/z=null/
faq.htm
