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How to practice french kissing
Tilt your head slightly to 1 side.
This prevents your nose from bumping into that of your partner's while french kissing. Even if you aren't practicing with a person, you should still get into the habit of tilting your head slightly.
If you decide to learn to french kiss with another person, you should be direct and let them know that you want to kiss them for practice, not necessarily because you have feelings for them. You can practice french kissing with your hand, a piece of fruit, or even your imagination.