For men:

• Use a indirect approach (instead of "I find you attractive," ask "What band is that?"). This gives women a chance to evaluate you before investing in you.

• When talking to a girl, make her work a bit. We value more the things that are scarce and that we have to work for.

• Use body language to convey high social status. Take up a lot of space with your gestures, talk to your group of friends (instead of hanging around in a corner and looking for girls), and touch others non-reciprocally.

For women:

• If you're just looking for sex, you can simply go up and ask — this works in 75% of cases. But if you want a relationship, make the man work a bit, as above.

• Use body language to invite men to talk to you. Men are generally bad at reading body language, though. So show clear signs of interest (like smiling) and do it repeatedly — you may have to show interest up to 12 times to get a man to approach.

For both:

• If you're interested in someone, touch that person slightly (don't be overly touchy). Studies show that we like people more when they touch us. Women like it because being comfortable touching women makes men seem higher-status. Men like it because it's a sign of sexual interest.