Laughing can also just be a nervous response. I can think of twice where the girl laughed when first seeing my tool which was just nervousness.
1 - Chinese masseuse giggles after the turn. So I ask, “What’s so funny?” She replies, “You so skinny but he so beeg!”
2 - Younger, less experienced female. As soon as he’s out she covers her mouth and starts giggling. So I ask, “You think he’s funny?”. She replies, “No, but he is scary!”