Bring it up to her gently. Show her that you do not intend to hurt her emotionally and physically, and that you're not with her just for the sex. Ultimately, she is the one who will have to decide. Fifteen is young to be having sexual relationships but it is her decision. Remember to use protection.
That would be sexual assault. Statutory rape is intercourse but all sexual deeds are illegal if the minor is below age of consent.
Ask her:)
In some states you are legally aloud to marry your 15 year old girlfriend. It would depend on the state that you are residing in.
Yes, a 15 year old can date a 20 year old although the teenager's parents may not be very happy about it. Because the 15 year old is considered to be a minor, he/she cannot have sexual relations with his/her partner. The 20 year old could face imprisonment if he/she took advantage of the 15 year old in a sexual manner.
Dating between a 15 year old and a 21 year old is fine as long as the 15 years old parents are willing, and they do not have any sort of sexual contact. They would have to wait until the 15 year old reached the age of sexual consent for the region they live in. In most cases that is 16.
Yes
Yes.
No. Dating is not illegal. If a 22 year old has sexual relations with a 15 year old, that is illegal. A 15 year old is not considered legally old enough to make the decision to have sex.
Sexual intercourse is illegal between a 15 year old and a 21 year old. Hanging out or dating someone is not illegal so as long as there is no sexual intercourse, it is fine.
It isn't illegal to have a 15 year old girlfriend but having sex with her will be a felony.
YES
So long as the relationship is not sexual.