i do think men place more emphasis on looks than women do majority of the time. (no disrespect to men once so ever, its not a problem, theyre just more visual). so I think if the guy felt he was more attractive looking than his partner he may not be as satisfied. where as a woman wouldn't mind being more attractive in the relationship because she craves more of a sense of security emotionally than looks.
regardless of gender I think if anyone is very unsatisfied with how their partner looks I don't think the relationship can be strong enough with that aspect completely dismissed. physical attraction is important just like having an emotional connection. but if two people are attracted to one another and they are strongly bonded emotionally it can work if one is decently more attractive than the other.
It's not about the 'scale' or 'amount' of attractiveness. Who even weighs there partner up like that? maybe some shallow people, but not most people. Most people take some being attractive as being just that.
Anyone can cheat, whether they are the 'attractive-er one' or not. Ultimately, it's about personality and the other person makes you feel.
Not really, I think it depends on the guy himself not his scale of attraction so to speak. Yes, these guys might generally get more girls that notice & flirt with him, but that doesn't mean anything if he's already content with whoever he's with. Girls in general just don't like competition. They feel that they'll have to do a whole lot more to keep this guy than the average looking one.