All five of the girls in this anal-only flick get "A's" for effort. These girls get their butt holes stretched through solid anal poundings that leave them drenched in sweat and dripping in man batter.

Jayna Oso steals the show with her growling, enthusiastic performance. This girl sweats like her body is one big gland. Katin has big natural taters, a very healthy butt and the most impressive gaping ability of all five girls. The girl is, to say the least, relaxed.

Although there is nothing creative or outstanding about the video, Straight to the Sphincter nevertheless succeeds with a simple formula: solid and nasty sphincter-stretching anal-intensive performances. This one's a no-brainer for fans of anal sex.

On a side note, though, there is nothing sexy about the word "sphincter." Even hot naked girls with their butts spread wide open can't make the word appealing. It's far too clinical.