It's a case of he's fat and average so "I have nothing to worry about" for two reasons:
1-I can be fat and below average too and don't have to feel inferior next to a lean Greek god
2- I'm inseure and a fat below average partner is less likely to be offered hot pussy when out with his mates for a few drinks....think Denarii out on the piss. More likely to get hit by lightening than have a woman look in his direction.