Expert - being overweight doesn't make ME feel shite, I quite like my body actually! But I get your point - when we don't feel we look our best, it's really, really hard to be sexual. I was the same size as I am now with my ex long-term bf and I felt like utter shite because he was always trying to "help" me lose weight, so when he told me I looked nice it just rang hollow. It's all about being happy in your body really!
Is for instance a guy's refusal to go down on a woman due to a perceived cleanliness issue a reasonable stand point and is both his and his partner's enjoyment of sex compromised as a result? For him, because from the start he is fretting that he might be expected to do it and for her because it can be an intense part of the love making process that she is being denied?
I'm not totally sure I get what you mean here, Mr N... do you mean a guy who refuses to go down on his girlfriend because he THINKS it's dirty or because it is, in fact, not very nice down there? I'm going to go with the first one because it's more of a real hang-up. I don't think it's a reasonable standpoint at all, whatsoever. For me, oral should come as standard with a basic sex package :) That goes for both parties! I used to have a HUGE issue with performing oral due to a nasty experience, but I made myself get over it - which is why I don't hold any truck with people who don't do it becuase they don't like it or they think it's icky or gross. Suck it up... literally!
The only hang up I have that I'm aware of is phone sex... I hate it I hate it I hate it. It creeps me out no end. Makes me feel silly and shy and just saps all my sexual confidence. Shudder.