Is too thin a turn off?

My boyfriend pointed out that he can feel my individual ribs and how they stick out a lot, and that I’m really thin etc during sex. And he suggested that I eat more, but not in a bad way, we are both just aware I’m low on the BMI scales. But he couldn’t specify if this was a bad or good thing for him? Is too thin of a women a turn off? I don’t look sickly just thin and petite.

Is too thin a turn off?
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