The gender of the two partners is irrelevant, only the age matters. Under Texas law, Sec 21.11(a) forbids sexual contact with persons under 17, but Sec 21.11(b) creates an "affirmative defense" if there is less than a 3-year age difference, and the contact was not by force, fear, etc.
A minor cannot "consent" to sexual activity.
To answer your question, it is illegal for anyone to have sex with a 16-year old in Texas, but if there is a less than three year age difference, there is an affirmative defense, and therefore there would likely not be a prosecution.
A good source of information about minor's rights and responsibilities is your school guidance office, the school health clinic, your public library, or your family doctor.
You didnt explain how authorities might be aware of the intimate contact, so I assume you are concerned that someone's parents have found out. Aside from age of consent laws, minors are generally required to obey reasonable parental instructions and parents have the right to disapprove of friendships or to various activities with friends.
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