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Smile and make eye contact. Strike up a conversation. Give compliments. Try some playful touching.

Article:
Classic flirtation tactics like smiling and making eye contact are good places to start. Whether you see him from across a room or you are sitting across a table from each other, smiling and making eye contact is a good way to show your interest. However, smiling and making eye contact is a friendly gesture, so it is a lower stakes version of flirtation that some other bolder options. Try making eye contact for a few seconds and then look away for a moment. Then, look at him again and see if he is still looking at you. If he is, then this might indicate that he finds you attractive. Flash him a smile to send the message that you also find him attractive. Before you ask a guy out, you will probably want to get to know him and find out if you two have anything in common. Otherwise, it might turn into a boring date. Ask him about his interests, likes, and dislikes, and background to start getting to know him. Some questions you can ask him include: What do you do for a living? What do you like to do for fun? What kind of music do you like? Did you grow up around here? Do you have any pets? Are you having a good time? Compliments are always appreciated, whether you are flirting with someone or not. By giving the guy a compliment, you can increase his confidence and send a message that you are attracted to him. If he's interested, then might reciprocate with a compliment of his own. If he's not interested, then he can politely say thanks and then change the subject. Try saying something like, "You have a great sense of style! I love your suit." Or, you can be a bit bold and say something like, "I am sorry if I am staring, but you have gorgeous eyes." Giving him a few playful touches is a fun way to flirt and gauge his interest at the same time. Try some brief, gentle touches to let him know that you are attracted to him. These gestures may also give him the confidence to touch you back. For example, you can try touching him on the arm or shoulder when he says something that you find interesting or funny. Or, if you want to be a little bolder, then you can try placing a hand on his back to guide him as you are walking through a crowded place together.