KK unimproved vs super loose passive

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($357.82)
Hero ($101.90)
CO ($226.15)
Button ($98.47)
SB ($101.70)
BB ($103.90)

Preflop: Hero is MP with K, K. SB posts a blind of $0.50.
UTG calls $1, Hero raises to $4, 1 fold, Button calls $4, 2 folds, UTG calls $3.

Flop: ($13.50) 5, 3, 5 (3 players)
UTG checks, Hero bets $10, Button folds, UTG calls $10.

Turn: ($33.50) 6 (2 players)
UTG checks, Hero bets $25, UTG calls $25.

River: ($83.50) Q (2 players)
UTG checks, UTG calls $62.90.

Final Pot: $146.40

this guy was something like 80vpip (seriously) I guess I could check behidn here, but hes super super super loose passive and I def can see him calling with TPTK, over pair, ect.

NH. Given your read, checking this river would be criminal. Even against an unknown I probably value-bet here.

oh.. I could also see him calling with A3.. loose passives think that AX on YYX flops is the nuts...

Originally Posted by boostNslide

oh.. I could also see him calling with A3.. loose passives think that AX on YYX flops is the nuts...

Been there and dealt with that a couple of times this weekend - in very similar circumstances.

I don't understand why you would even think of checking behind?