If the guys are actively being dicks and you know about it, it's a bit dickish. It's like knowing about a hole in the locker room, and leading other girls by it and boys to the other end as well. But ultimately if they're more so just curious, I don't see the total harm in it. It's dishonest, which from a pride standpoint I don't care for, but it's the internet, if I said I was a purple dinosaur on here, and I got to join the purple dinosaur club because of it, I'm not preventing anyone else from joining the club, and if I'm not out to hurt anyone it's not like I'm hurting anything. As for getting free stuff in games, it's a bit malicious, but anyone that would just randomly give stuff in a game to a girl probably needs a wake up call anyway for being that desperate.
With the whole "what do girls talk about when boys aren't around," I'm assuming it's roughly the same as what guys talk about when girls aren't around. It's just a space you feel more comfortable sharing some information with than others. I also don't tell my guy friends a lot of my anxiety and depression issues just because I feel less comfortable talking about that with them than I do the girls I know. You feel more likely to open up about different things with the different people in your life, differing mostly on how you've grown to interact with them, and the guys in my life we interact in a more destructive manner towards ourselves and each other, and the girls we interact in a more productive manner, building each other up and trying to actively help each other out. I myself need both, the reality check of my guys, and a chance to build myself up with the girls. Maybe I'll meet a few guys that can make me feel good about myself, and a few girls I feel comfortable enough to endearingly call "******," but as things are, my interactions are as they are right now, and I don't feel the rush to change that. Maybe that's sexist of me, maybe I'm furthering the gay agenda, maybe I'm enabling the patriarchy. Ultimately, I don't fully care, I imagine there aren't too many girls that would line up for the degrading I give to my guy friends, nor many guys willing to open up enough to hear about and show genuine care for another guy out there, so I feel I'm doing everyone a service in delegating my bullshit as much as possible. In theory I think it's important to tear down these barriers, and break these chains of love, and open up to people only differentiating on their personality, rather than sex organ, but in practice, it can be a bit more difficult for some people, and I don't think it's inherently a bad thing either to have some circles that you act differently with. People are complicated, and no one other individual will ever be capable of getting you on a deep enough level and being tolerable enough with that you can be everything that you are around them. You need more groups of friends really.