The song "Biology" by Girls Aloud is about being attracted to someone and wanting them to be genuine and honest in their feelings towards you. It expresses a desire for a deeper connection without any mind games or deceit. The lyrics suggest that the narrator wants the person they're interested in to be real, to say they need and love them sincerely, rather than playing games or manipulating them. They long for a genuine, intimate relationship where they can truly be themselves. The chorus emphasizes the idea of being able to see through someone's façade and recognizing their true intentions. The line "you can't mistake my Biology" suggests that the narrator can discern if someone is being genuine or not, as their biology or instincts can't be fooled. The song also touches on the idea of partying and getting caught up in the thrills and desires of the moment. The second verse mentions the consequences of indulging in parties and the dangers of giving in to temptation. Overall, "Biology" conveys a message of wanting a genuine connection with someone, without any games or manipulations. It encourages honesty, authenticity, and a deeper understanding of each other's true intentions.