It's actually even easier than less handsome brehs IMO.
Because if I'm actually going to claim you, you gotta be pretty amazing. But then again, I'm also the kinda guy who views just kocking down a bunch of women as pointless. Sex is sex, you other than the different faces and some slight differences and it's really all the same feeling. Some might be nastier than others.
If you choose right from the jump, it's not too hard to stay faithful. As long as you remain on your shyt, stay in shape, you know that if it ends you'll be okay and can go right into finding someone else or having fun.
I'm decently handsome, not a model or anything, but my brehs who are less handsome actually cheat more not because of options, but because they want to hold on to their good thing that's rare but also step out. Where as I'm more inclined to leave once I'm miserable, and just keep it pushing