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Can you be more specific where? He insults Romeo when he is on his way to Juliet's balcony. Romeo hears him. Mercutio makes all kinds of rude sexual references,
"If love be blind, love cannot hit the mark.
Now will he sit under a medlar tree
And wish his mistress were that kind of fruit"
Romeo says that Mercutio has never been hurt by love.
"He jests at scars that never felt a wound."
In Act 2, Scene 4 Mercutio accuses Romeo of giving them "the slip" , to satisfy his sexual purposes as well.