This is how the model penal code defines rape. I think every state has substantially altered this definition for their own statutes, primarily for the purpose of making the statute gender neutral. However, it's important to look at how the definition of rape has changed over the past 40 or 50 years. Compare the MPC to the current Pennsylvania statute. You'll notice that according to both definitions, mere acquiescence is insufficient to prove rape. Thus, if a man is "overactive" with a woman, if she is conscious and presents no resistance, he hasn't raped her even if in her mind she was screaming "No no no no!" Specifically, the difference between the two definitions is that the MPC really requires that the amount of force used or threatened to be used is so substantial that it puts the life of the victim at risk; either the woman submits or she dies. The PA definition simply requires "forcible compulsion" which is simply a question of fact for the jury as to whether force was used. You can see how it is a much lower burden.

MPC: (1) Rape. A male who has sexual intercourse with a female not his wife is guilty of rape if:

(a) he compels her to submit by force or by threat of imminent death, serious bodily injury, extreme pain or kidnapping, to be inflicted on anyone; or

(b) he has substantially impaired her power to appraise or control her conduct by administering or employing without her knowledge drugs, intoxicants or other means for the purpose of preventing resistance; or

(c) the female is unconscious; or

(d) the female is less than 10 years old.

Pennsylvania (a) Offense defined.--A person commits a felony of the first degree when the person engages in sexual intercourse with a complainant:

(1) By forcible compulsion.

(2) By threat of forcible compulsion that would prevent resistance by a person of reasonable resolution.

(3) Who is unconscious or where the person knows that the complainant is unaware that the sexual intercourse is occurring.

(4) Where the person has substantially impaired the complainant's power to appraise or control his or her conduct by administering or employing, without the knowledge of the complainant, drugs, intoxicants or other means for the purpose of preventing resistance.

(5) Who suffers from a mental disability which renders the complainant incapable of consent.