Most Helpful Guy
Depends on context if its in a relationship and its casual I'd say it's a sign of affection. If it's in a relationship and it's done with a lot of energy I'd say he's testing you to see if you want sex. If it's someone you haven't known long at all I'd say it means he's after sex.
I'd personally go with the passionate movie scene sloppy kiss for a fuckbuddy and more of a non-delayed casual kiss for someone I love. A kiss isn't that important so it's either something I think would be hot to her and get things going or I think it's an outward sign to that person I care about them in more then just a fleeting relationship kind of way