I am 21 and my boyfriend is 17 is it ok for us to be having sex....I know it sounds really bad on my part....but he will be 18 before i turn 22....is this ok...

The age of consent to have sexual incourse in Pennsylvania is 16.

3122.1. Statutory Sexual Assault: Except as provided in section 3121 (relating to rape), a person commits a felony of the second degree when that person engages in sexual intercourse with a complainant under the age of 16 years and that person is four or more years older than the complainant and the complainant and the person are not married to each other.

3121 is forcible rape.

The age of majority in Pennsylvania is 18. He would still be considered a minor in the eyes of the law. If his parents were to press the issue, they could have recourse against you legally with any contribution on your part to the delinquency of the minor; for example: alcohol consumption, consumption of a controlled substances, smoking cigarettes, skipping school, etc...