I'd say that mom raised them right. Dad's a complete wimp. Mom knew what she wanted and she went and made sure her boys could deliver - cock and cum up her pussy.
Yeah, big cocks matter, but what matters even more is that cocky "cum get my dick you slut" attitude and ability to get it up again and again and again.
This is one of the videos that helped push me past the hesitation i was having. I showed it to my son after our first time. We watch it all time together now.