I dont know.
If she has only had sex with one person... then she could be truthful in that she does not want to do it again.
What if the guy she was with before PROMISED to marry her, but didnt.. and she wanted to only have sex with someone she married? She may feel very jaded, even embarassed at what she did before insisting she never make that mistake again. That is very plausible. But we do not know everything that happened, she is not here, just him. And she may not have told him everything.. again, back to the possible shame.
So if that is the case, and she WONT have sex again until marriage because she believes in it .. ok. So that is where she is. No harm in that really. So long as she is being honest.
But the porn site.. how do we know it was HER first off?
She has a parent in her house? right? she does NOT live alone.. so who is to say SHE did it.
And if she did.. sorry, I can still stand behind the idea that when ( and if it was her ) the site was opened, it may NOT have been for sexual pleasure. I have searched and seen some really freaky stuff and it definitely was NOT for pleasure. A lot of shock value and just the plain old " Oh my god they really DO that" .. kind of searching.
If you saw my history a few months ago , you would think I wanted to have sex with a monkey. Dont ask
So how do we know it was not something like that? Even the most puritan of people can 'search' for something out of curiosity and not have it mean anything sexual.