>>14519124Cause she has an illness producing severely low immunoglobins, making her body essentially unable to fight off anything due to a broken immune system that she needs blood donations on frequent levels to ensure antibodies can exist at all.
She is basically a Quarian who can get sick from anything and her body wouldn't be able to fight it off naturally.
And Sex is extremely close contact and if the partner carries anything, not even an STD but somehow any germs that can get into her body somehow, due to her illness, her body wouldn't be able to fight it off at all, so it can spread in her system without any defenses in her body.
Can even be kissing and the other person forgetting to brush his teeth and has even the slightest dirt or germ, it can get into her body.
