It's all about proper eye contact. When I see an attractive guy, I do the following:
Step 1: Find a table directly facing the Object of Desire. If somebody is already seated at table directly facing Object of Desire, chase them away by screaming, in the queeniest, shrillest voice you can muster, "OH MY GOD!!! YOU TOUCHED MY ASS!!!! WHAT DO YOU THINK I AM, A HOMO
??? IS EVERYBODY IN THIS PLACE A HOMO
??? OH, HEAVENS HELP ME, SAINT MARIAH/MADONNA/CHER/ANGELINA/VICTORIA B"
Step 2: Sit down. Make eye contact with Object of Desire. To get his attention, try clearing throat loudly and obviously while staring penetratingly at him. My preferred pose is one of intense concentration: both elbows on table, chin resting on fists. If Object of Desire does not notice eye contact, clear throat again, and louder. Repeat as needed.
Step 3: When Object of Desire's friends finally poke and prod him into noticing you staring derangedly at him and he looks up at you, grin. Wickedly and suggestively, with teeth. Lick your lips seductively, all the while wiggling your eyebrows wildly. Do not break eye contact.
Step 4: As the bartenders/bouncers are escorting you firmly from the establishment, maintain eye contact with Object of Desire, even if this means swiveling your head completely 180 degrees around. Salivate a little. Drool lets him know you really care.
Step 5: Right up until the moment the police and/or mental health professionals arrive, continue staring in at Object of Desire from nearest window. Mouth 'I love you' repeatedly. Occasionally smack your forehead on the glass for emphasis.
Follow these steps, my friend, and you shall never fail in attracting the attention of your man. Try it!