Critics of this argument generally agree that unplugging the violinist is permissible, but claim there are morally relevant disanalogies between the violinist scenario and typical cases of abortion. The most common objection is that the violinist scenario, involving a kidnapping, is analogous only to abortion after rape. In most cases of abortion, it is said, the pregnant woman was "not" raped but had intercourse voluntarily, and thus has either tacitly consented to allowing the embryo to use her body (the tacit consent objection), or else has a duty to sustain the embryo because the woman herself caused it to stand in need of her body (the responsibility objection). Other common objections turn on the claim that the embryo is the pregnant woman's child whereas the violinist is a stranger (the stranger versus offspring objection); that abortion kills the embryo whereas unplugging the violinist merely lets him die (the killing versus letting die objection); or, similarly, that abortion intentionally causes the embryo's death whereas unplugging the violinist merely causes death as a foreseen but unintended side-effect (the intending versus foreseeing objection; cf the doctrine of double effect).