[.xxxx.]

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<font color="black">Flop:</font> ($8) 5[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/heart.gif[/img] (4 Players)
<font color="red">SB bets $2</font>, BB calls $2, UTG calls $2, Hero calls $2

<font color="black">Turn:</font> ($16) 2[img]/images/graemlins/diamond.gif[/img] (4 Players)
<font color="red">SB bets $3.50</font>, BB calls $3.50, UTG calls $3.50, Hero calls $3.50


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Are you just calling down because you fear they have AA/KK/random 5?

Raising the flop would give you the information about whether another player holds the range you're playing so passively against. AS played you were playing for showdown value alone, but you were vulnerable to any overcard considering how loose and passive the other players were. Raising would have limited the overcard range and allow you to either extract value while ahead or get away sooner if you were behind vs calling down two more streets and folding to a scare card.