A longing stare
"Out at a crowded, noisy bar? Motion for him to come close so you can tell him something. Instead, send chills down his spine by licking his ear and blowing warm breath on the same spot."
If the ol' Wet Willy doesn't work, slide your fingers down the back of your man's jeans, finger the edge of his boxer shorts, and then yank upwards. And then kick him in the shin.
"When you come back from the gym, walk right up to him and say 'The whole time I was on the treadmill, all I was thinking about was how much I wanted to go down on you.'"
I'm 90% sure that only a very small percentage of people actually look sexier when they're sweaty and exhausted. But hey, if it had just said, "Tell your boyfriend you want to blow him. He'll probably be down," I'd have cancelled my subscription.
"Stare longingly at his package for a few seconds." Not puppy-dog longingly. Russian-spy longingly. If you can't figure out which is which, say "I long to experience its pleasure power" a couple times in your head as you do it.