Why are women allowed to relentlessly flirt and touch at work?

A girl at work said hi to me, wrapped her arms around my arm, her hands on my arm, and she basically hugged and ran her hands around my arm. She said "hi sweetie!" To me.

The girls do this to eachother. They do this to the guys too.

But guys are never allowed to do such a thing. I mean, at least, we don't. We are all justifiably afraid I would imagine. Also, we aren't women so we tend to stray away from feminine things that women do.

But either way, men aren't allowed to say hi sweetie with a hug and a run my hands on your arm to a woman. That would never ever be appropriate unless you and the girl had established that kind of relationship previously.

It's OK. It's nice. I don't mind that the girls touch me and they're sweet to me. It's just funny how only they can do it.
Why are women allowed to relentlessly flirt and touch at work?
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