Certainly, all Superhumans are sterile in their basic form.
Or, more accurately, "Their superior genes are not compatible with the backward human race."
( If you remember the dialogue where Deryl was taking your blood and commenting on your genes.)
But given the fact that MC is a shapeshifter, he should technically be able to
downgrade his sperm to human level.
It wouldn't prevent his sperm from evaporating as a separate part of his body, but it would almost certainly be fertile.
At least for a few minutes...