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Despite what you may think, Marine is not a nymphomaniac, several times she has expressed that she is not horny under some circumstances (for example under a lot of stress or when she is sometimes sick/tired) she has also shown legitimate disgust when the chat is super horny and they suggest/question some weird paraphilia with her.
I think Senchou has a slightly higher libido than the average woman out there but she is absolutely more vocal about it, as well as I think that for certain sexual activities you would have to convince her too much because I doubt she would give in immediately.
I'm not saying that Marine is a self-righteous woman who is afraid of sex but I also don't think she is a slut who doesn't mind riding any cock, if anything Marine sounds like a woman with a healthy libido who would enjoy sex but not everything you might suggest she do, I doubt she would even enjoy swallowing cum for example.