Who did Serena lose her virginity too?

It was definitely not Nate in the 表示する like it was in the books, as we know that in the 表示する she had sex with Nate during Sophomore Year, but she made the quote in 1x12 to Dan;
"In Freshman 年 I dated the swim team captain, and he gave me a key to the pool so we could go and.... あなた know..." (clearly hinting sex)
So we know によって the time she had ロスト 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 ロスト it to Nate in the pilot but when it came down to it the 表示する became way different then the books. For sure Nate ロスト his v-card to Serena @ the Shepard wedding (Chuck 発言しました it), Blair ロスト hers to Chuck jr 年 (limo ride any1), and Chuck ロスト his to Whoregina in 6th grade (Blair 発言しました it). That's all I know sry.

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

In the 本 it was nate but in the 表示する I HIGHHHLY doubt it, its some ランダム that we don't know.

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