The KISS principle ("Keep it Simple, Stupid") states that design simplicity should be a key goal and unnecessary complexity avoided.
The Vacuum Kiss
A vacuum kiss occurs when you suck the air out of your partner's mouth. It's best if you're not chewing gum. The kiss can be done at any time when you're kissing your partner on the lips. Most often the vacuum kiss happens by accident, but the best kissers always introduce some element of a vacuum kiss into any long make-out session (extended kissing and cuddling). This can be done by gently sucking some air from your partner's mouth.
Lip-o-suction is a type of kiss in which the guy kisses the upper lip while the girl kisses his lower lip. Then they reverse. It's very popular with young people who like variety and playfulness in kissing.
The good thing is that lip-o-suction is perfectly safe. There's no tongue involved, so you can breathe through the entire kiss. Also, your partner doesn't need to know anything about lip-o-suction for you to do this kiss. You simply kiss the upper lip, then the lower lip. If your partner wants to follow your lead and imitate you, that's fine but it's certainly not necessary. In other words, lip-o-suction can be done by one person to the other without having the kiss done back.