
So the more I think about it, the more it makes sense.
Saitama probably doesn't have sex that often anymore. With his speed and strength, he'd probably kill his partner.
Since Genos can be fixed on a regular basis and is as tough as hell, he is possibly the only one who can uke for Saitama.
Well there you have my two cents worth.

Ahaha so funny 'he kill his partner' I not the only one who's think that, well his strenght make me wonder this too but if it genos I think it'll be okay lol!

You were right (๑•ㅂ•)و✧only genos

What? Upgrade from one punch man to one thrust man? Hopefully it's not one shot man...
Your welcome
I think that this possible ending was the best thing for the story...
but that little part of me is wondering if we get to see them do the nasty...
ლ(´ڡ`ლ)(づ ̄ ³ ̄)づ