Date rape is rape. It doesn't matter if you know the victim, whether you took them out on a date, whether they drank during the date, or whether they led you on during the date. Non-consensual sex is rape, no matter what preceded it. And those convicted of date rape face the same penalties as those convicted of raping strangers.
But a prior relationship between the accuser and alleged perpetrator could complicate the determination of guilt. Here are the possible penalties for rape and how the issue of consent arises in cases of date rape.