(a) It is an affirmative defense to prosecution that the actor engaged in the proscribed conduct because he was compelled to do so by threat of imminent death or serious bodily injury to himself or another.
(b) In a prosecution for an offense that does not constitute a felony, it is an affirmative defense to prosecution that the actor engaged in the proscribed conduct because he was compelled to do so by force or threat of force.
(c) Compulsion within the meaning of this section exists only if the force or threat of force would render a person of reasonable firmness incapable of resisting the pressure.
(d) The defense provided by this section is unavailable if the actor intentionally, knowingly, or recklessly placed himself in a situation in which it was probable that he would be subjected to compulsion.
(e) It is no defense that a person acted at the command or persuasion of his spouse, unless he acted under compulsion that would establish a defense under this section.