From a guys point of view:

We don't care if you talk to other guys.
We don't care if you're friends with other guys.
But when you're sitting next to us, and some random guy walks into the room
and you jump up and tackle him, without even introducing us, yeah, it pisses us off.
It doesn't help if you sit there and talk to him for ten minutes without even acknowledging the fact that we're still there.
When guys meet a girl, that they fall hard for and spend whole nights
and days spending it with them, they obviously like you, its not that they want a huge friendship
We don't care if a guy calls you, but at 2 in the morning we do get a little concerned. Unless someone is dying,
it can wait till the morning.
Also, when we tell you you're pretty, gorgeous, cute or stunning, we freaking mean it.
Don't tell us we're wrong. We'll stop trying to convince you.

The sexiest thing about a girl is confidence.
Yeah, you can quote that.

Don't be mad when we hold the door open. Take Advantage of the mood