do you ever fold bottom set to aggression in unraised pot?

[flite]

Titan No-Limit Hold'em, $0.50/$1.00BB

BB ($114.05) (Hero)
MP2 ($102.35)
MP3 ($112.90)
CO ($100.00)
Button ($155.55)
SB ($103.80)

Preflop: Hero is BB with 3[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/spade.gif[/img]
<font color="#666666">4 folds</font>, SB calls $0.50, Hero checks,

Flop: 4[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img] ( $2 )
SB checks, <font color="#CC3333">Hero bets $1.50</font>, <font color="#CC3333">SB raises to 5.0</font>, <font color="#CC3333">Hero raises to 11.0</font>, <font color="#CC3333">SB raises to 17.0</font>, <font color="#CC3333">Hero raises to 40.5</font>, <font color="#CC3333">SB raises All-In $102.8</font>

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villain is no donkey - he won't limp with AA or AK.
do you fold here?