A. A person commits sexual conduct with a minor by intentionally or knowingly engaging in sexual intercourse or oral sexual contact with any person who is under eighteen years of age.
B. Sexual conduct with a minor who is twelve years of age or under and who suffers serious physical injury is a class 1 felony and is punishable by imprisonment in the custody of the state department of corrections for natural life as determined and in accordance with the procedures provided in section 13-752. A defendant who is sentenced to natural life is not eligible for commutation, parole, work furlough, work release or release from confinement on any basis. Sexual conduct with a minor who is under fifteen years of age is a class 2 felony and is punishable pursuant to section 13-705. Sexual conduct with a minor who is at least fifteen years of age is a class 6 felony. Sexual conduct with a minor who is at least fifteen years of age is a class 4 felony if the person is more than sixty months older than the victim and is older than twenty-one years of age at the time of the offense and, if placed on probation, the convicted person shall be sentenced to serve one year in jail. Sexual conduct with a minor who is at least fifteen years of age is a class 2 felony if the person is or was in a position of trust and the convicted person is not eligible for suspension of sentence, probation, pardon or release from confinement on any basis except as specifically authorized by section 31-233, subsection A or B until the sentence imposed has been served or commuted.