Definitely not. Age can have significant implications in a sexual relationship, such as legality and maturity levels. If a girl lies about her age, it can lead to all sorts of problems. For example, it may put the other person at risk of facing legal consequences unknowingly. Also, it undermines the trust that should be at the core of any relationship, sexual or not.
No, it's not ethical. Lying about age in such a context is wrong as it involves deception in a very serious matter. Consent should be based on honesty and full understanding, and age can be a crucial factor, especially when it comes to legal and ethical boundaries regarding sexual relationships.
It is not ethical at all. In many places, there are laws in place to protect minors from engaging in sexual activities. When a girl lies about her age, she is not only violating ethical norms but also potentially putting herself and the other person in a difficult legal situation. Moreover, in a healthy relationship, honesty about age, as well as other aspects, is fundamental for mutual respect and proper communication.