Should I assume that I'm beat here?

[bighomage]

In a small sample size SB is very loose (50% VPIP), and this is the first time he's raised in the 30 hands I've played against him. Do I have to assume I'm beat here, or can I be aggressive?

Party Poker 2/4 Hold'em (9 handed) converter

Preflop: Hero is BB with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img].
<font color="#666666">4 folds</font>, MP3 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">SB raises</font>, Hero calls, MP3 calls.

Flop: (6 SB) A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, MP3 folds, SB calls.

Turn: (5 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, SB calls.

River: (7 BB) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, SB calls.

Final Pot: 9 BB