This couple are sending off pretty strong signals of sexual attraction. She is leaning into him with her breast pressed against his chest. Sitting on his lap is a fairly strong indicator of interest and ownership. His hand on her butt likewise indicates to other men that she is with him. He has his legs spread wide apart which is a male body language clue that he is interested. By sitting with his legs apart, the male is displaying attention to his package. This couple have eyes only for each other.