Rape, like any objectively measurable offense, is the violation of another's control of self. Therefore, gaining sexual compliance from antother through any form of coersion is rape, be that intimidation, physical means, blackmail, drugging, et cetera.
Lying to someone to get sex, while wrong by simple virtue of being lying, is not necessarily
rape (one lying about one's income or actions to impress another into engaging in sex), although it can be (one lying about one's power/influence to intimidate another into surrendering sex).
Consensual sex with someone who has lowered their own mental state voluntarily (one having sex with another who chose to imbibe excessive amounts of alcohol without coercion) is not rape, because neither party violated the other's control of self or actions.
Simply "pressuring" someone into sex, as long as no intimidation, physical or pharmaceutical coercion, or deception is involved, is not rape. Since the person being convinced into sex remains in control of their own actions, without duress, it is consensual.
edited 16th Jan '11 1:00:56 PM by Wanderhome