thisisyesterday - have you had a lot of negative comments from people because you have three boys? For example, how much hard work it is or "poor you, having three boys"? Wrong for people to say, I know - I already have the comments about having three girls and the hormones, wait until they are teenagers, etc etc.
I don't think people are wanting girls more than boys. Years ago, people had large families - no-one really thought of gender. Chances are, mixed family would result anyway. These days, money is tight, people have less children and I think a lot of people would like one of each if they had to stop at two, in an ideal world, but would be content to have either sex.
If you read my post, I don't have stereotypical views as to why I preferred to have boys. I've got two chances to do a better job than my mother - that's how I view it - maybe three chances - got to be close to at least one of them throughout teenage years, right? 
I also heard that boys are more loving as children than girls - can't comment on a personal level obviously but I have seen that in a lot of families I know. I have also heard this:-
A boy is a son until he meets a wife and a girl is a daughter - a daughter for life, meaning girls are closer to their mothers when they leave home. Again, I cannot personally comment.
You hear all sorts of reasons why people would like a certain gender - but I don't think it is a problem unless it is made into one, like my friend's mother and her son - truly awful what she did to him.
When I tried for a family, with my DH's love and support, I knew I wanted a boy but when I was ttc, I was just hoping to get pregnant. I am sure most people are like that. Then, when I was pregnant, of course I was hoping for it to be a boy but I was more looking to get past the first 12 weeks (we lost a few before conceiving our first and had D and Cs and other things). Again, I think most people have this attitude - let's make sure the baby is safe. So when people do start out ttc, I think most people are wanting to get pregnant and have a safe pregnancy and birth as their top priority, as it should be. The gender issue doesn't have to be a big one.