I love it how nearly every reply to the questions has been 'Well I don't do this !@#$% thing and I'm always really nice to women but there are some people who do this and I don't know why"
That doesn't answer a question. Stop thinking that she's asking you personally and think of why others would do this.
We're insensative because of the fact we've grown up with other men, and just like other men, we have testosterone, so while around one another, we always try to be better than everyone else, it's just natural, we insult, punch, and so on to others around us, then when it comes to women, if we see one as a friend, we naturally act the way we always act with friends, insulting and 100% honest, which comes off as rather 'insensitive' while it's just what we're used to.
Public adjusting? Lets say your bra is almost making one of your breasts almost be cut in half, making one half saggy and giving the other support, you'll want to re-adjust so that it's comfortable, well, that's the same with us!
Penis obsessing probably comes from women saying that they prefer bigger penises, and so some men decide that smaller penises give less pleasure and therefore cannot satisfy a woman, which is seen as an insult (which is true)
This question is rather personal, but I think that if someone really does like a girl in the sense of personality etc. then no, they wouldn't see themselves like that, yet from lots of porn and other male influence (and those males get influenced from porn) when people see a 'hot chick with a big ass' or something to that effect, they do not care for personality and imagine themselves with the girl in a porno flick, no personality, just them 'wanting your !@#$%' etc.
'Bad Sex' is a term not often heard within the male side of things, but most of the time it would be from instinct and the like of the big penis thing, and so they judge on breasts, saying 'bigger is better' and men probably don't like to do all the work.
What do I know, I'm still a virgin. >__>
Oh, and here's a fun fact, Men polled on average say they've been with 13 women, Women say 7 men, what this says; Women say they've been with less men, and men, the ego-testosterone filled beings, say they've been with more women.