Who did Serena lose her virginity too?

It was definitely not Nate in the mostra like it was in the books, as we know that in the mostra she had sex with Nate during Sophomore Year, but she made the quote in 1x12 to Dan;
"In Freshman anno I dated the swim team captain, and he gave me a key to the pool so we could go and.... te know..." (clearly hinting sex)
So we know da the time she had Lost her virginity during/possibly before Freshman Year.

We just... don't know who to...

Damn, now I want to know! Hahah!

Ya I think Serena was suppose to have Lost it to Nate in the pilot but when it came down to it the mostra became way different then the books. For sure Nate Lost his v-card to Serena @ the Shepard wedding (Chuck detto it), Blair Lost hers to Chuck jr anno (limo ride any1), and Chuck Lost his to Whoregina in 6th grade (Blair detto it). That's all I know sry.

in the libri she loses it to nate but in the mostra ,don't think so .it might have been carter baizen ,just guessing here ,i have no proof .

In the libri it was nate but in the mostra I HIGHHHLY doubt it, its some random that we don't know.

It's never really revealed who Serena loses her virginity to.