Looks like sarcasm is at its peak. So, the man said that 'I don't need sex', that's common because he just needs to look at his T-shirt to satisfy himself. Then the woman behind him has an emoji which indicates that she is laughing, perhaps laughing at the T-shirt man's joke or maybe laughing at the irony that even though the man is saying he does not need sex, he is still seeking attention through that T-shirt.