If she says 'not back there' she just needs some aggressive tonguing to loosen her up and she will ready to take you in

If she says 'back there please' it's because she's keeping a contraband cellphone up the regular hole.

Angry Dolphin
The true angry dolphin involves normal sex, as in where the penis is in the vagina, and the man proceeds to pull out and insert into the woman's ass. Angered, the woman responds with the yelling of "Enh! Enh! Enh! Enh!!!!" This is basically the sound a dolphin makes. Assuming the chic isnt into anal, she will emit this sound with much anger, but you'll probably do it anyway....because deep down she really wants it.