How to play this?

[Saborion]

Opponent appears to be slightly loose pre and somewhat loose post. Haven't really been aggro so far, so his preflop raise kind of stood out a bit. Easy preflop call? What do we do on this flop? If we had flopped TP + flush draw, how does that change things?

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) FTR converter on zerodivide.cx (http://www.zerodivide.cx/converter)

saw flop|<font color="#C00000">saw showdown</font>

UTG ($332.45)
Hero ($231.10)
Button ($58.55)
SB ($57.66)
BB ($19)

Preflop: Hero is MP with 7/images/graemlins/heart.gif, J/images/graemlins/heart.gif. SB posts a blind of $0.50.
<font color="#CC3333">UTG raises to $3</font>, Hero calls $3, <font color="#666666">1 fold</font>, SB (poster) calls $2.50, <font color="#666666">1 fold</font>.

Flop: ($10) 3/images/graemlins/heart.gif, J/images/graemlins/spade.gif, 5/images/graemlins/club.gif <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">UTG bets $7</font>

[JustToast]

Pretty loose PF call. I don't hate it though given you have some read on the opponent.

I raise the flop to try and take her down. If he calls, I take a free card on the turn for pot control and call a river bet. If he re-raises I fold.

You definately want SB out regardless.

[Saborion]

[ QUOTE ]
Pretty loose PF call. I don't hate it though given you have some read on the opponent.

[/ QUOTE ]
What should the effective stack size be for this call to be ok?