And the challenge and/or condition is that you get to pick one of them to suck your cock, while you fuck the other (you get to pick: pussy or ass NOT both) But they can't switch!
One of the reasons I chose the way I did is because Jenna Haze has some of the hottest-sounding dirty talk of any porn star I can think of. Hearing her yell things like "Yeah baby, fuck my tight little asshole!" in her sweet, innocent sounding voice always makes her scenes that much hotter. So if Jenna were giving me a blowjob I wouldn't be able to enjoy her dirty talk as much.