fuck that bro.
logn story short, i had a girl who did that, i told her my concerns, and what happened? exactly what i thought...bitch took e when she said she wasn't going to, with some faggot...then we broke up and they started goin out....then 5 years later she hit me up and i fucked her...she then told me dude was pathetic and couldn't get her to cum unless she was on top......so she got it...and then we parted ways a month or so later...oh yeah, we took E together when we met back up...lol.....
so it's like this
your girl + E - your presence = she's either cheating or highly considering it
OR you have one of the .05% of females who can go out and do that and not be a fucking slut.