True story: Some people are more into lippy kisses, while others prefer more tongue. The reason why people kiss this way is either because that's all they know or what they ultimately prefer. Either way, it's definitely something to discuss so you can get on the same page.
10. Give Positive Feedback To Each Other
Nothing boosts a kiss like telling each other, “You’re a great kisser.” If you can't say that without feeling like a liar, though, try sandwiching the positive feedback. In other words, give them a compliment, then a constructive critique, then another compliment. This will soften the blow of pointing out a "flaw," while also making it easier to overcome.