High reproduction rate versus sexual fidelity

We introduce fidelity into the bit-string Penna model for biological ageing and study the advantage of this fidelity when it produces a higher surviva l probability of the offspring due to paternal care. We attribute a lower r eproduction rate to the faithful males but a higher death probability to th e offspring: of non-faithful males that abandon the pups to mate other fema les. The fidelity state of the father is transmitted to the male offspring (with or without error). We show that nature may prefer a lower reproductio n rate tu warrant the survival of the offspring already born.