So my girlfriend is 15. Im 18. It s legal to date in our state, but not legal to have sex. When she turns 16 I will still be 18. The age of consent is 16 in our state.

Haven't you answered your own question?

Is having sex your only goal for this relationship? If it is plan on it not lasting.

I didn't see a question, but the law is the least of your worries since most parents don't care about the law when it comes to a teen daughter. As a father, somebody is going to pay dearly for breaking MY law! You are an adult, so man up whatever state your in, and find out what the parents rules are. That is if you care.

PS

Some mothers are even MORE VICOUS than fathers. What would you do if an 18 year old adult was sniffing around YOUR soon to be 16 year old daughter?

Ask her dad if it’s okay to have sex with her on her 16th birthday. Oh, and are you ready for parenthood?