Pfff. you guys gave me some silly Mental image again.
The Mc wakes up one morning with a burning desire, all he could think was "i have this need, The NEED FOR BREED!"
and darts off into the horizon trying to fuck anything that dares not to be pregnant in his field of vision.
Nah, obviously our guy wouldn't do that, he's still a gentleman, he won't force himself on anyone that doesn't want to.
besides, he felt PLENTY awkward at the beginning of the game at the prospect of fucking his surrogate sister and mother, until they all thought "ah to hell with it, we aren't related anyways, so whats the problem?"
so i really fucking doubt he's even gonna entertain the idea of screwing his actual mother. however. would be a hilarious Easter egg if he actually does it if you named your player character Oedipus.