if ur mom and dad were not interested sexually, they would fuck, now u wouldnt here, look at this in a large scale
So, what's you are acually doing here is contradicting yourself. You see, they having sex does not change my life like at all. Person can be born without their parents having sex at all. But having children takes toll of mother's health, and couple's QoL. But you wouldn't know that, coz your sex will never bring other person into this world.