It's a real choice. It's a free choice. She chose one miserable choice over another miserable choice, and I don't see how that takes away her consent.When you don't have a real choice I wouldn't call it "accept", much less "consent". And when somebody abuses his power to take away any reasonable free choice from you, and thus eliminates consent... that is rape.
EDIT: This does not in any way condone the behavior of the sailor who took advantage for his own personal gratification. I just don't believe it meets the legal definition of rape according to US Law.
I believe Sweden has much broader definitions of rape; according to Swedish law he might be guilty of rape.