Plushness

Beauty is in the eye of the beholder.
What constitutes ugly to one may be beautiful/attractive to another.
I like describing what society defines as ugly: rugged and tough looking.
 

Your question is based on two relative assumptions: "ugly guy" and "good boyfriend" - which means that any answer you will get is bound to be relative, hence inconclusive.
 

Not sure about ugly guys, but younger guys definitely make better boyfriends. (Not that I've ever, ever, ever been with one)
 

Girls: I must date an ugly guy to test this theory.

Mosan: at a time where we're struggling for the fight for women's rights, the comment on domesticated housewives is a bit on the cheesy side. But i will forgive you for your disclaimer (sleepy+grumpy+shitty mood).. Meanwhile, in efforts to answer your question (kinda), i heard & you can confirm this if you wish, that ugly girls are better in bed!