Lincoln, I think you should be alert to all possibilities here.
I was referring to and paraphrasing Duplodon's comments:
"I really wouldn't be happy about such a young girl having sex because I am not sure with 14 year old girls it is often as straightforward as 'it feels good', or that this is a great reason to be having a sexual relationship at this age.
"I would work hard to manage my feelings about it, and talk very openly, non-judgementally and with curiosity to my kid about the function of sex in their life at that time. What function does it serve? What values does it serve? Eg being connected, being loving, closeness, intimacy, joy, passion, exploration.. Or... fitting in, avoiding loneliness, seeking independence, wanting maturity, meeting other's needs... I wouldn't put these words in her mouth, but I'd listen and explore and encourage most needs to be met also in other ways. Sex often feels as though it offers far more meaning than it does, especially to very young people. It's not that big a deal if it is a part of a rich, meaningful life.. But where it is a substitute for or serves to avoid discomfort or uncertainty about the self or connection to others it can be damaging.
"We always talked about stuff like this in our house in this way, right back when I was 11. There's nothing wrong with being explicit about morals, values and expectations in your home. Underage sex carries a lot of risks for girls in particular, that's unavoidable.
"And I agree most girls want a boyfriend. But most girls also feel they have to sexually satisfy boys to have one and are much less certain boys should sexually satisfy them, often trading sex for a relationship. And so it begins. This stuff isn't unproblematic."
What is going on here really needs to be teased out. If there are undercurrents of filling in any blanks, taking short cuts to security or maturity or social status, fitting in, meeting the needs of others or feeling she has to in order to secure the means of fitting in, or trying to feel connected or not to lose a connection already established, that pattern of imperatives can haunt a young woman and lead down many a dead end, relationship wise.