I don't think Sam could have possibly known she was inexperienced. For all he knew, she was banging Captain Zolandia and those weird Romita tooth-monsters on the reg.
For that matter, when she says "I'd never done that before," how do we know what she meant by "that"? It could have just been her first time that wasn't an exercise in depraved deviance.
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While my tongue is planted firmly in cheek, Sam said no more wine. Its right there. She said live a little. According to the rules put forth by the... tumblr... crowd...Jet is clearly the aggressor.
My opinion? Two majority adults, who have known each other longer than some married couples, engaged in consensual coitus. Move along, nothing to see here.
Surely you're not implying that an adult woman choosing to initiate sexual activity with an adult man is lacking self-discipline, or acting like a hooker? Because that would be a horribly misogynist thing to say about women in general, many of whom make similar decisions every day.
So what if she's new to Earth? What, they don't have sex where she's from? And how is it disrespectful for an adult male to have sex with an adult female? Especially when she's not only clearly consenting to it, but initiating it in the first place?
What I think is disrespectful is in assuming an adult woman is incapable of making her own choices, and must be shielded from doing so by men who are simply doing The Right Thing.
Two adults choosing to have sex is not a 'moral weakness'. It's simply two adults choosing to have sex. And two unattached adults hooking up is a bit different than a married person cheating on their spouse.