My friend and her boyfriend were both naked, and very close. He ejaculated right by her vagina, and his sperm made their way inside.
Alot of people say "ya right...as if"...and that's fine. It is true however, and it's up to you if you want to believe it, and take the proper precautions.
Like I said, it is extremely rare, but it does happen.
STI stands for sexually transmitted infection. Basically the same as STD (sexually transmitted disease).
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