Yes, but two is better then one.
Studies have demonstrated the presence of HIV in the pre-ejaculate of an infected person, which can lead to the disease AIDS.[4]
Many also express concern that pre-ejaculate may contain sperm which can cause pregnancy, using this to argue against the use of coitus interruptus (withdrawal) as a contraceptive method. There have been no large-scale studies of sperm in pre-ejaculate, but some smaller-scale studies suggest that no sperm is present and thus pre-ejaculate is ineffectual at causing pregnancy.[4][5] It is likely, however, that pre-ejaculate which follows a recent ejaculation will contain sperm, as some ejaculate is always left in the duct after orgasm.[6][
http://en.wikipedia.org/wiki/Precum
Your sort of right with the precum and withdrawal.
Im not going to disagree with you with any point you bring up because they are valid, unlike a certain groups
OMGZ GODZ DONT LIKE ITZ constant raving. They are well researched and documented. I do beleive Abortion should be legalised, but the women should only have it done if its absolutetly neccesary and not for her own self gain.
rant.
Any person though who says a teenager under the age of 16 shouldnt recieve the option should be chemically castrated. /rant