I'm not a guy but what I see is men don't like drama. If you are a woman, keep it down a bit.
They like compliments, and intelligent conversations. Mostly like a little humor and a little sarcasm if they like it.
oh! one thing is some men like their space. Give them room to relax, be with the boys, and be themselves. Try not to call them as much either. The more space you give them the more they will miss ya.
One last note, always dress pretty and use colors (stay away from beige, and baby yellow colors). Blue, reds, purples (most men like this color). Keep your hair, nails and skin looking radiant. Wear makeup if you like, if not, some lip gloss and mascara will do.
Well, that's just some. I will post more as I remember. good luck!