How do you get your partner to lose weight and be a better kisser?

I love my gal but not really into kissing her Because she doesn't kiss that well and she has gained some weight so I'm not totally chasing her for sx any more.. whats' the best solution.. for the gals how would you prefer to be informed about this from your hubby?
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we still have sx as much as she wants and we like it a lot but I don't feel the drive as much as I would if things were physically more compatable. and I don't feel okay with saying anything mean. I love her. and she loves me.
How do you get your partner to lose weight and be a better kisser?
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