Generally speaking, Santana Lopez tended not to care too much about the consequences of her actions. Seriously, she was seventeen. Who the fuck cared if she bullied a few losers, told a few lies, and had sex with a few doezen football players? The liklihood of that effecting her on the long term was slim to none, and she saw no reason to pay that much attention. Sure, after she joined Glee, that changed somewhat (she gained a social conscience or whatever), but for the most part, she really didn't give a fuck.
Which was precisely why it pissed her off so much when something she did came to bite her in the ass. What happened to her right to do stupid shit while she was still young, dammit? She hadn't even graduated high school yet; the universe owed her at least one more year of it.
Had she not been scared shitless at the topless guy walking into her room, that exact thought would have been what went through her head. Instead, all she thought was 'please, not again.' Which, interestingly, manifested in an odd exclamation.