Technically, sex can mean vaginal insertation, or in simpler words, that a penis is inside a vagina.

That makes me wonder... When we are born, we come out through the vagina of our mother, and our penis is inside her then. Wouldn't that mean every single guy has pretty much lost his virginity already?

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram