<human>: *And yes, I'm aware that I won't be able to get an answer from "most girls". But below is why I'm asking this.*

I'm at the bar when I over hear a hottie chick nearby talking about how some dude keeps texting her cause he's worried about them not using condoms. Hottie says she's on b.c. but the dude still is freaking out. She goes on to call him a loser because "all the other guys are thankful that I don't ask them to put on a condom".

One of the friends makes a comment about how the hottie's boyfriend is dumb for not having a clue that she's cheating despite the girls night outs and b.c.. Hottie says she just has to "bat my pretty brown eyes and say I just need to regulate my period".

ಠ\_ಠ

...I know many girls that have used the same line on me with regards to b.c.. Is there any truth to this "regulate your period" thing? Reddit females, honestly, are most girls just bs'ing?

Summarize the given text in a few sentences.
<bot>: Hot girl at bar is just using b.c. because she's promiscuous and does not want to risk getting unintentionally knocked up. Wondering if this is actually pretty common and I'm just an idiot.*