I guess it isn't obvious for some people, but Emma's cowgirl is just a joke option.
Due to her nature she can't get on top of you without crushing you.
And it's not just a matter of weight, she's just bound to the earth.
Well, Qarinah didn't really say no, but instead a "not yet".
I mean, she keeps saying "We have not met physically" so often that it would be a disappointment if we don't meet the "real" Qarinah some day.