I'm not one of the fellas, so maybe I need to stay out of it, but I had to laugh at your post. I have always preferred to hang out with "the fellas" rather than being one of the gals, and I sometimes wonder why I went into nursing as a 2nd career!
A few thoughts:
1. Just curious: is it the internet shopping itself that bugs you, or what they are shopping for? If one of the guys were looking at fishing tackle at cabelas.com, would that be as bothersome to you? I personally don't think it looks professional to be doing online shopping at work at all, but if your hospital has no policy against it, I guess it's everyone's right to do it if it doesn't take them away from their work.
2. I think there is variability in how women feel/talk about their kids, which I'm sure you see among your coworkers. Some of us work by choice (I work just a few days a week so that I can be home with my kids), while others need to work long hours to put food on the table. Call me old-fashioned, but I think most women feel the distance from their kids as a hardship in a way that a lot of guys (not all) don’t; also, I think women tend to talk more about their kids in general, but particularly when they are away from them. I’m also speaking as one who doesn’t live, sleep, and breathe my kids, but I think that’s less common than what you are seeing.
3. Women who trash-talk their husbands/SOs make me crazy, and I’m lucky to work with people who don’t do this. That said, realize that women process by talking to each other. And talking. And talking. And if they are involved with a real dirtball, there’s a lot more talking. You’re in a unique position to be a NICE guy they know, but don’t feel like you have to fix it or defend all men to them. It’s not your fault.
Unfortunately, the things you are mentioning can be pretty typical in groups of women. It might also depend on the unit; in my unit, I don’t see as much of this as I have on other floors. The one male nurse we have might disagree with me, though. Nursing benefits from having more men in the field, but I wouldn’t expect an even ratio unless you become a CRNA. Good luck to you!