How would you have kids without sex. Indeed, the desire to "reproduce" (to produce next generation) has already been programmed in everyone. Some show it strongly but others hide it with lovely word plays. But essentially all are the same dirty sexual things.
First of all sexual relationships are not "dirty", they are part of the human itself and again, people can feel a genuine desire of having a kid without feeling lust. Your logic literally means the following: Want to have a kid -> Needs to involves sex So because a sexual desire can also be lust -> So that means all kids are product of lust Which is completely a generalization and I don't agree with that.