AK hand vs UTG raiser who bets out on the Turn. River call?

[aLOWdAkING]

Party Poker 3/6 Hold'em (9 handed) converter

I've got no reads on anybody, watching the Illinois-UNC game when I see a UTG raise, a UTG+1 cold call, and AK in MP. Time to roll.

Preflop: Hero is CO with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises</font>, UTG+1 calls, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">3 folds</font>, UTG calls, UTG+1 calls.

Flop: (10.33 SB) 6[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, UTG+1 checks, <font color="#CC3333">Hero bets</font>, UTG calls, UTG+1 calls.

Turn: (6.66 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG bets</font>, UTG+1 folds, Hero calls.

Is this too loose a call? I'm getting about 7-1 on my money, so I think it's ok.

River: (8.66 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets</font>, Hero folds.

With this board, it's awfully tempting to call. I'm getting about 4-1 on my money if I'm lucky enough to split with an unimproved Ace, so I have to be good 20% of the time (is this math correct?) But it's hard to think Villain would bet out on the turn with AK or AQ unimproved.

Final Pot: 9.66 BB