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Eye contact is fundamental to flirting and attraction. The eyes truly are the windows to the soul, so let him see yours. If you can’t look him in the eye, he’ll probably assume that you’re not interested in getting to know him.  Though some eye contact is good, don’t hold his gaze for too long. There’s a fine line between looking and staring. Generally, women show they’re attracted by lifting their eyebrows, making eye contact, tilting their heads down and to one side, and then looking away. This is possibly the easiest way to let a guy know you like him. When you smile at a guy, you appear open and friendly. That lets him know you’re approachable, and someone he can be himself with.  The best smile is a genuine smile. People can read when a smile is fake, so just be natural! If you've got great teeth or cute dimples, smiling helps show them off. This isn’t always appropriate in the workplace, so be careful with this step. Some types of touch are commonplace in any environment, but some would feel uncomfortable in a workplace. There are three levels of flirtatious touch.  A friendly touch happens in almost all working environments and can be a simple handshake or tap on the shoulder. "Plausible deniability touch" is more personal and includes putting an arm around someone’s shoulder or giving them a hug. It could seem out of place in a fast-paced kitchen, but could come off as caring after a difficult office meeting. Touching someone’s face is considered “going nuclear” in terms of touch. There are few work situations in which you’d likely touch a coworker’s face. However, if he has an eyelash on his cheek, that could be a perfect opportunity to gently and flirtatiously remove it for him. Everyone likes a little flattery now an then. Point out something you like or appreciate about him. It’s best not to only focus on his appearance, though. Think of things he did that you thought were cool, or an accomplishment he’s proud of.  Let him know you're always happy to see him. His personality makes the long days much more fun. Compliment something he did well, such as giving aa great presentation or paying attention to detail. This will show you've been noticing him. Studies have shown that women are the most successful at flirting when they’re direct. If you’re not getting any response from your crush, it may be that he simply isn’t getting the message, and you need to be more obvious.  Being direct has its limits. If you feel you’re sending all the right cues and not getting anything back, he may be trying to politely let you know he’s not interested. If you fear this may be the case, just continue to be your usual charming self, and see if he is inspired to make a move himself. You can be direct without being demanding. Say, "I'd love to get together sometime," instead of, "Will you get a drink with me?" Flirting via phone or social media can be either more discreet or more public, depending on how you do it. If you send a flirty text here or there, chances are no one else will find out. But nosy coworkers will notice if you’ve liked every one of his Facebook pictures.  Always be extra careful when flirting digitally. For example, did you click “reply” or “reply all”? Avoid anything that’s inappropriate for work. It’s okay to ask him out out for cocktails after a long work day. Sending suggestive pictures is not.
Make eye contact. Smile. Touch him. Compliment him. Be direct. Flirt digitally.