LOL, that happenend to me as well the first time... :P
Strangely enough, when I kissed some random girl who thought I was cute, I didn't get a boner at all...
I was 14 and was dating this girl some months, and I was very nervous... but the first kiss ever was in the school. It sucked hard. Then one hour later we did it again and it was very nice. However, this was all without tongue, so does this really count? Nah, probably not...
Anyway, a week...