*facepalm*
Spongebob is weird...but I don't believe he can make a child (who hasn't even developed the biological means to get aroused), gay.
And at the point that he does develop the means to say: "Ho yeah...that's hot!"
It will most likely be the busty beyond her years, blonde headed, cheerleader in his class' pep rally, doing a backflip, where her panties are on just a little bit too tight...and not a square, flat chested, yellow, annoying, psychopathic burger flipper.